Intermediate Geometry : Hexagons

Study concepts, example questions & explanations for Intermediate Geometry

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Example Questions

Example Question #21 : How To Find The Area Of A Hexagon

A circle is placed in a regular hexagon as shown in the figure.

7

If the radius of the circle is \(\displaystyle 6\), then find the area of the shaded region.

Possible Answers:

\(\displaystyle 552.01\)

\(\displaystyle 534.09\)

\(\displaystyle 560.22\)

\(\displaystyle 498.63\)

Correct answer:

\(\displaystyle 552.01\)

Explanation:

13

In order to find the area of the shaded region, we must first find the areas of the hexagon and the circle.

Recall how to find the area of a regular hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(\text{side})^2\)

Substitute in the length of the given side to find the area of the hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(16)^2\)

\(\displaystyle \text{Area of Regular Hexagon}=384\sqrt3\)

Next, recall how to find the area of a circle.

\(\displaystyle \text{Area of Circle}=\pi\times\text{radius}^2\)

Substitute in the given radius to find the area of the circle.

\(\displaystyle \text{Area of Circle}=\pi\times (6)^2\)

\(\displaystyle \text{Area of Circle}=36\pi\)

Now, find the area of the shaded region by subtracting the area of the circle from the area of the hexagon.

\(\displaystyle \text{Area of Shaded Region}=\text{Area of Hexagon}-\text{Area of Circle}\)

\(\displaystyle \text{Area of Shaded Region}=384\sqrt3-36\pi\)

Solve and round to two decimal places.

\(\displaystyle \text{Area of Shaded Region}=552.01\)

Example Question #22 : How To Find The Area Of A Hexagon

A circle is placed in a regular hexagon as shown in the figure.

8

If the radius of the circle is \(\displaystyle 4\), then find the area of the shaded region.

Possible Answers:

\(\displaystyle 780.22\)

\(\displaystyle 724.19\)

\(\displaystyle 703.58\)

\(\displaystyle 791.51\)

Correct answer:

\(\displaystyle 791.51\)

Explanation:

13

In order to find the area of the shaded region, we must first find the areas of the hexagon and the circle.

Recall how to find the area of a regular hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(\text{side})^2\)

Substitute in the length of the given side to find the area of the hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(18)^2\)

\(\displaystyle \text{Area of Regular Hexagon}=486\sqrt3\)

Next, recall how to find the area of a circle.

\(\displaystyle \text{Area of Circle}=\pi\times\text{radius}^2\)

Substitute in the given radius to find the area of the circle.

\(\displaystyle \text{Area of Circle}=\pi\times (4)^2\)

\(\displaystyle \text{Area of Circle}=16\pi\)

Now, find the area of the shaded region by subtracting the area of the circle from the area of the hexagon.

\(\displaystyle \text{Area of Shaded Region}=\text{Area of Hexagon}-\text{Area of Circle}\)

\(\displaystyle \text{Area of Shaded Region}=486\sqrt3-16\pi\)

Solve and round to two decimal places.

\(\displaystyle \text{Area of Shaded Region}=791.51\)

Example Question #22 : How To Find The Area Of A Hexagon

A circle is placed in a regular hexagon as shown in the figure.

9

If the radius of the circle is \(\displaystyle 9\), then find the area of the shaded region.

Possible Answers:

\(\displaystyle 784.76\)

\(\displaystyle 800.55\)

\(\displaystyle 791.25\)

\(\displaystyle 806.32\)

Correct answer:

\(\displaystyle 784.76\)

Explanation:

13

In order to find the area of the shaded region, we must first find the areas of the hexagon and the circle.

Recall how to find the area of a regular hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(\text{side})^2\)

Substitute in the length of the given side to find the area of the hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(20)^2\)

\(\displaystyle \text{Area of Regular Hexagon}=600\sqrt3\)

Next, recall how to find the area of a circle.

\(\displaystyle \text{Area of Circle}=\pi\times\text{radius}^2\)

Substitute in the given radius to find the area of the circle.

\(\displaystyle \text{Area of Circle}=\pi\times (9)^2\)

\(\displaystyle \text{Area of Circle}=81\pi\)

Now, find the area of the shaded region by subtracting the area of the circle from the area of the hexagon.

\(\displaystyle \text{Area of Shaded Region}=\text{Area of Hexagon}-\text{Area of Circle}\)

\(\displaystyle \text{Area of Shaded Region}=600\sqrt3-81\pi\)

Solve and round to two decimal places.

\(\displaystyle \text{Area of Shaded Region}=784.76\)

Example Question #23 : How To Find The Area Of A Hexagon

A circle is placed in a regular hexagon as shown in the figure.

10

If the radius of the circle is \(\displaystyle 10\), then find the area of the shaded region.

Possible Answers:

\(\displaystyle 920.38\)

\(\displaystyle 965.37\)

\(\displaystyle 943.31\)

\(\displaystyle 895.36\)

Correct answer:

\(\displaystyle 943.31\)

Explanation:

13

In order to find the area of the shaded region, we must first find the areas of the hexagon and the circle.

Recall how to find the area of a regular hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(\text{side})^2\)

Substitute in the length of the given side to find the area of the hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(22)^2\)

\(\displaystyle \text{Area of Regular Hexagon}=726\sqrt3\)

Next, recall how to find the area of a circle.

\(\displaystyle \text{Area of Circle}=\pi\times\text{radius}^2\)

Substitute in the given radius to find the area of the circle.

\(\displaystyle \text{Area of Circle}=\pi\times (10)^2\)

\(\displaystyle \text{Area of Circle}=100\pi\)

Now, find the area of the shaded region by subtracting the area of the circle from the area of the hexagon.

\(\displaystyle \text{Area of Shaded Region}=\text{Area of Hexagon}-\text{Area of Circle}\)

\(\displaystyle \text{Area of Shaded Region}=726\sqrt3-100\pi\)

Solve and round to two decimal places.

\(\displaystyle \text{Area of Shaded Region}=943.31\)

Example Question #24 : How To Find The Area Of A Hexagon

A circle is placed in a regular hexagon as shown in the figure.

11

If the radius of the circle is \(\displaystyle 10\), then find the area of the shaded region.

Possible Answers:

\(\displaystyle 1182.33\)

\(\displaystyle 1240.07\)

\(\displaystyle 1090.37\)

\(\displaystyle 1193.67\)

Correct answer:

\(\displaystyle 1182.33\)

Explanation:

13

In order to find the area of the shaded region, we must first find the areas of the hexagon and the circle.

Recall how to find the area of a regular hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(\text{side})^2\)

Substitute in the length of the given side to find the area of the hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(24)^2\)

\(\displaystyle \text{Area of Regular Hexagon}=864\sqrt3\)

Next, recall how to find the area of a circle.

\(\displaystyle \text{Area of Circle}=\pi\times\text{radius}^2\)

Substitute in the given radius to find the area of the circle.

\(\displaystyle \text{Area of Circle}=\pi\times (10)^2\)

\(\displaystyle \text{Area of Circle}=100\pi\)

Now, find the area of the shaded region by subtracting the area of the circle from the area of the hexagon.

\(\displaystyle \text{Area of Shaded Region}=\text{Area of Hexagon}-\text{Area of Circle}\)

\(\displaystyle \text{Area of Shaded Region}=864\sqrt3-100\pi\)

Solve and round to two decimal places.

\(\displaystyle \text{Area of Shaded Region}=1182.33\)

Example Question #25 : How To Find The Area Of A Hexagon

A circle is placed in a regular hexagon as shown in the figure.

12

If the radius of the circle is \(\displaystyle 12\), then find the area of the shaded region.

Possible Answers:

\(\displaystyle 1885.88\)

\(\displaystyle 1892.05\)

\(\displaystyle 1875.54\)

\(\displaystyle 1863.39\)

Correct answer:

\(\displaystyle 1885.88\)

Explanation:

13

In order to find the area of the shaded region, we must first find the areas of the hexagon and the circle.

Recall how to find the area of a regular hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(\text{side})^2\)

Substitute in the length of the given side to find the area of the hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3}{2}(30)^2\)

\(\displaystyle \text{Area of Regular Hexagon}=1350\sqrt3\)

Next, recall how to find the area of a circle.

\(\displaystyle \text{Area of Circle}=\pi\times\text{radius}^2\)

Substitute in the given radius to find the area of the circle.

\(\displaystyle \text{Area of Circle}=\pi\times (12)^2\)

\(\displaystyle \text{Area of Circle}=144\pi\)

Now, find the area of the shaded region by subtracting the area of the circle from the area of the hexagon.

\(\displaystyle \text{Area of Shaded Region}=\text{Area of Hexagon}-\text{Area of Circle}\)

\(\displaystyle \text{Area of Shaded Region}=1350\sqrt3-144\pi\)

Solve and round to two decimal places.

\(\displaystyle \text{Area of Shaded Region}=1885.88\)

Example Question #26 : How To Find The Area Of A Hexagon

A rectangle is attached to a regular hexagon as shown by the figure.

1

If the length of the diagonal of the hexagon is \(\displaystyle 14\), find the area of the entire figure.

Possible Answers:

\(\displaystyle 314.20\)

\(\displaystyle 211.31\)

\(\displaystyle 198.56\)

\(\displaystyle 215.22\)

Correct answer:

\(\displaystyle 211.31\)

Explanation:

13

When all of the diagonals of a regular hexagon are drawn in, you should notice that the hexagon is divided into six congruent equilateral triangles. The length of the diagonal is twice the length of a side of one of the equilateral triangles.

Thus, the diagonal of a hexagon is also twice the length of a side of the regular hexagon.

\(\displaystyle \text{Side Length of Hexagon}=\frac{\text{Diagonal of Hexagon}}{2}\)

Substitute in the given diagonal to find the side length of the hexagon.

\(\displaystyle \text{Side Length of Hexagon}=\frac{14}{2}=7\)

Now, recall how to find the area of a regular hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3(\text{side length})^2}{2}\)

Substitute in the value of the side length to find the area of the hexagon.

\(\displaystyle \text{Area of Hexagon}=\frac{3\sqrt3(7)^2}{2}=\frac{147\sqrt3}{2}\)

Next, notice that the hexagon shares a side with the length of the rectangle.

Recall how to find the area of a rectangle.

\(\displaystyle \text{Area of Rectangle}=\text{length}\times\text{width}\)

Substitute in the length and the width of the rectangle to find the area.

\(\displaystyle \text{Area of Rectangle}=7\times12=84\).

In order to find the area of the entire figure, add the areas of the hexagon and rectangle together.

\(\displaystyle \text{Area of Entire Figure}=\text{Area of Hexagon}+\text{Area of Rectangle}\)

\(\displaystyle \text{Area of Entire Figure}=\frac{147\sqrt3}{2}+84\)

Solve and round to two decimal places.

\(\displaystyle \text{Area of Entire Figure}=211.31\)

Example Question #931 : Plane Geometry

A rectangle is attached to a regular hexagon as shown by the figure.

2

If the diagonal of the hexagon is \(\displaystyle 10\), find the area of the entire figure.

Possible Answers:

\(\displaystyle 102.49\)

\(\displaystyle 107.51\)

\(\displaystyle 108.92\)

\(\displaystyle 104.95\)

Correct answer:

\(\displaystyle 104.95\)

Explanation:

13

When all of the diagonals of a regular hexagon are drawn in, you should notice that the hexagon is divided into six congruent equilateral triangles. The length of the diagonal is twice the length of a side of one of the equilateral triangles.

Thus, the diagonal of a hexagon is also twice the length of a side of the regular hexagon.

\(\displaystyle \text{Side Length of Hexagon}=\frac{\text{Diagonal of Hexagon}}{2}\)

Substitute in the given diagonal to find the side length of the hexagon.

\(\displaystyle \text{Side Length of Hexagon}=\frac{10}{2}=5\)

Now, recall how to find the area of a regular hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3(\text{side length})^2}{2}\)

Substitute in the value of the side length to find the area of the hexagon.

\(\displaystyle \text{Area of Hexagon}=\frac{3\sqrt3(5)^2}{2}=\frac{75\sqrt3}{2}\)

Next, notice that the hexagon shares a side with the length of the rectangle.

Recall how to find the area of a rectangle.

\(\displaystyle \text{Area of Rectangle}=\text{length}\times\text{width}\)

Substitute in the length and the width of the rectangle to find the area.

\(\displaystyle \text{Area of Rectangle}=5\times 8=40\).

In order to find the area of the entire figure, add the areas of the hexagon and rectangle together.

\(\displaystyle \text{Area of Entire Figure}=\text{Area of Hexagon}+\text{Area of Rectangle}\)

\(\displaystyle \text{Area of Entire Figure}=\frac{75\sqrt3}{2}+40\)

Solve and round to two decimal places.

\(\displaystyle \text{Area of Entire Figure}=104.95\)

Example Question #932 : Plane Geometry

A rectangle is attached to a regular hexagon as shown by the figure.

3

If the diagonal of the hexagon is \(\displaystyle 12\), find the area of the entire figure.

Possible Answers:

\(\displaystyle 147.47\)

\(\displaystyle 153.53\)

\(\displaystyle 144.44\)

\(\displaystyle 161.61\)

Correct answer:

\(\displaystyle 153.53\)

Explanation:

13

When all of the diagonals of a regular hexagon are drawn in, you should notice that the hexagon is divided into six congruent equilateral triangles. The length of the diagonal is twice the length of a side of one of the equilateral triangles.

Thus, the diagonal of a hexagon is also twice the length of a side of the regular hexagon.

\(\displaystyle \text{Side Length of Hexagon}=\frac{\text{Diagonal of Hexagon}}{2}\)

Substitute in the given diagonal to find the side length of the hexagon.

\(\displaystyle \text{Side Length of Hexagon}=\frac{12}{2}=6\)

Now, recall how to find the area of a regular hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3(\text{side length})^2}{2}\)

Substitute in the value of the side length to find the area of the hexagon.

\(\displaystyle \text{Area of Hexagon}=\frac{3\sqrt3(6)^2}{2}=54\sqrt3\)

Next, notice that the hexagon shares a side with the length of the rectangle.

Recall how to find the area of a rectangle.

\(\displaystyle \text{Area of Rectangle}=\text{length}\times\text{width}\)

Substitute in the length and the width of the rectangle to find the area.

\(\displaystyle \text{Area of Rectangle}=6\times 10=60\).

In order to find the area of the entire figure, add the areas of the hexagon and rectangle together.

\(\displaystyle \text{Area of Entire Figure}=\text{Area of Hexagon}+\text{Area of Rectangle}\)

\(\displaystyle \text{Area of Entire Figure}=54\sqrt3+60\)

Solve and round to two decimal places.

\(\displaystyle \text{Area of Entire Figure}=153.53\)

Example Question #933 : Plane Geometry

A rectangle is attached to a regular hexagon as shown by the figure.

6

If the diagonal of the hexagon is \(\displaystyle 30\), find the area of the entire figure.

Possible Answers:

\(\displaystyle 875.33\)

\(\displaystyle 839.57\)

\(\displaystyle 812.40\)

\(\displaystyle 901.50\)

Correct answer:

\(\displaystyle 839.57\)

Explanation:

13

When all of the diagonals of a regular hexagon are drawn in, you should notice that the hexagon is divided into six congruent equilateral triangles. The length of the diagonal is twice the length of a side of one of the equilateral triangles.

Thus, the diagonal of a hexagon is also twice the length of a side of the regular hexagon.

\(\displaystyle \text{Side Length of Hexagon}=\frac{\text{Diagonal of Hexagon}}{2}\)

Substitute in the given diagonal to find the side length of the hexagon.

\(\displaystyle \text{Side Length of Hexagon}=\frac{30}{2}=15\)

Now, recall how to find the area of a regular hexagon.

\(\displaystyle \text{Area of Regular Hexagon}=\frac{3\sqrt3(\text{side length})^2}{2}\)

Substitute in the value of the side length to find the area of the hexagon.

\(\displaystyle \text{Area of Hexagon}=\frac{3\sqrt3(15)^2}{2}=\frac{675\sqrt3}{2}\)

Next, notice that the hexagon shares a side with the length of the rectangle.

Recall how to find the area of a rectangle.

\(\displaystyle \text{Area of Rectangle}=\text{length}\times\text{width}\)

Substitute in the length and the width of the rectangle to find the area.

\(\displaystyle \text{Area of Rectangle}=15\times 17=255\).

In order to find the area of the entire figure, add the areas of the hexagon and rectangle together.

\(\displaystyle \text{Area of Entire Figure}=\text{Area of Hexagon}+\text{Area of Rectangle}\)

\(\displaystyle \text{Area of Entire Figure}=\frac{675\sqrt3}{2}+255\)

Solve and round to two decimal places.

\(\displaystyle \text{Area of Entire Figure}=839.57\)

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