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Intermediate Geometry : Hexagons

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Example Question #1 : Hexagons

A regular hexagon has a radius of $2\:cm$ . Find the perimeter.

Possible Answers:

$12\:cm$

$6.9\:cm$

$12.1\:cm$

$12.2\:cm$

$7.0\:cm$

Correct answer:

$12\:cm$

Explanation:

Perimeter_of_a_hexagon

The only information given in the problem is the radius. From the radius, we are expected to solve for the perimeter. But in order to do so, we have to go through a few small steps. The initial goal is to solve for the length of one of the sides. Once one of the sides has been found, the perimeter can be solved for by multiplying the side length by the number of sides ().

In order to solve for the side (or as some call it, the base side), we can use right triangles.

Perimeter_of_a_hexgon_resolution

The first step is to solve for the internal angles of the hexagon. This can be solved through $\frac{180(n-2)}{n}$ , where is the number of sides.

$\frac{180(6-2)}{6}$

$\frac{180(4)}{6}$

$120^{\circ}$ = internal angle measurement

This angle gets bisected in the right triangle we can draw using the radius. This means that the bottom right corner of the figure is $60^{\circ}$ . Now that we have one side and one angle measure, we can solve for the base of the triangle in one of two ways.
1. Using trigonometric functions (SOH CAH TOA)
2. Remembering the rules of a 30/60/90 triangle

Using the rules of the 30/60/90 triangle, where the hypotenuse equals the value and the side opposite of $30^{\circ}$ (in this case, our base) is $\frac{h}{2}$ . Because h=2 , this means that our base is ; however, because the base of the triangle only makes up half of the length of a side, this means that the side length is actually $2\:cm$ .

Now that we have the value of the side length, we can solve for the perimeter using the formula mentioned previously:

$P=2\cdot6=12$

$P=12\:cm$

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Example Question #2 : How To Find The Perimeter Of A Hexagon

If the side of a hexagon has a length of 6ab , what is the perimeter of the hexagon?

Possible Answers:

36ab^2

36a^2b^2

a^2b^2

36ab

Correct answer:

36ab

Explanation:

The perimeter of a hexagon is:

P=6s

Substitute the side length and solve for the perimeter.

P=6(6ab)=36ab

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Example Question #3 : How To Find The Perimeter Of A Hexagon

If the side length of a hexagon is $\sqrt6$ , what is the perimeter?

Possible Answers:

$6\sqrt6$

$6+\sqrt6$

$2\sqrt3$

Correct answer:

$6\sqrt6$

Explanation:

Write the perimeter formula for a hexagon. Substitute the side length and solve.

$P=6s=6(\sqrt6)=6\sqrt6$

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Example Question #4 : How To Find The Perimeter Of A Hexagon

What is the perimeter of a hexagon if a side length is 100 ?

Possible Answers:

300

900

600

Correct answer:

600

Explanation:

A hexagon has 6 sides.

Given the length of the side is 100, the perimeter is:

$P=6s = 6\cdot100 =600$

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Example Question #811 : Intermediate Geometry

If the lengh of a side of a hexagon is $\frac{a}{2}$ , what is the perimeter?

Possible Answers:

$\frac{a}{12}$

$\frac{a}{6}$

Correct answer:

Explanation:

Write the formula for the perimeter of a hexagon.

P=6s

Substitute the side and simplify.

$P=6\left(\frac{a}{2}\right)=3a$

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Example Question #1 : How To Find The Perimeter Of A Hexagon

If the side of a hexagon is a+2b , what is the perimeter of the hexagon?

Possible Answers:

6a+6b

$\frac{1}{6}a+2b$

72ab

6a+12b

6a^2+12b^2

Correct answer:

6a+12b

Explanation:

Write the perimeter formula for a hexagon, substitute the side length, and simplify.

Remember to distribute the 6 through to all parts within the parentheses.

P=6s=6(a+2b) = 6a+12b

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Example Question #2 : How To Find The Perimeter Of A Hexagon

If the side length of hexagon is $\frac{2}{3}abc$ , what is the perimeter of the hexagon?

Possible Answers:

4abc

$\frac{abc}{18}$

12abc

$\frac{abc}{36}$

$\frac{abc}{9}$

Correct answer:

4abc

Explanation:

Write the formula for the perimeter of a hexagon, substitute the length of the side, and simplify.

$P=6s=6\left(\frac{2}{3}abc\right)=4abc$

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Example Question #8 : How To Find The Perimeter Of A Hexagon

Suppose the two side lengths of a hexagon added to . What is the overall perimeter of the hexagon?

Possible Answers:

18a

27a

Correct answer:

Explanation:

Write the formula for the perimeter of a hexagon.

P=6s

Since equals two sides of a hexagon, one side will have a length of $\frac{3a}{2}=1.5a$ .

Substitute this length into the perimeter formula and evaluate.

P=6s=6(1.5a)=9a

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Example Question #9 : How To Find The Perimeter Of A Hexagon

If the side of a hexagon is $\frac{a}{6}+\frac{b}{24}$ , what is the perimeter?

Possible Answers:

$a+\frac{b}{4}$

$\frac{a}{4}+2b$

$a^2+\frac{b^2}{4}$

6a+4b

$6a+\frac{b}{4}$

Correct answer:

$a+\frac{b}{4}$

Explanation:

Substitute the length $\frac{a}{6}+\frac{b}{24}$ into the hexagon perimeter formula and simplify.

Remember to distribute the 6 to all parts within the parentheses.

$P=6s = 6\left(\frac{a}{6}+\frac{b}{24}\right) = a+\frac{b}{4}$

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Example Question #10 : How To Find The Perimeter Of A Hexagon

Find the perimeter of the regular hexagon.

Possible Answers:

Correct answer:

Explanation:

When all the opposite sides of a regular hexagon are connected, you should notice that six congruent equilateral triangles are created:

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

$\text{Diagonal}=2(\text{side})$

$\text{Side}=\frac{\text{Diagonal}}{2}$

Plug in the given diagonal to find the length of a side.

$\text{Side}=\frac{14}{2}=7$

Now, recall how to find the perimeter of a regular hexagon:

$\text{Perimeter}=6(\text{side})$

Plug in the side length to find the perimeter.

$\text{Perimeter}=6(7)=42$

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Intermediate Geometry : Hexagons

Study concepts, example questions & explanations for Intermediate Geometry

All Intermediate Geometry Resources

Example Questions

Example Question #1 : Hexagons

Example Question #2 : How To Find The Perimeter Of A Hexagon

Example Question #3 : How To Find The Perimeter Of A Hexagon

Example Question #4 : How To Find The Perimeter Of A Hexagon

Example Question #811 : Intermediate Geometry

Example Question #1 : How To Find The Perimeter Of A Hexagon

Example Question #2 : How To Find The Perimeter Of A Hexagon

Example Question #8 : How To Find The Perimeter Of A Hexagon

Example Question #9 : How To Find The Perimeter Of A Hexagon

Example Question #10 : How To Find The Perimeter Of A Hexagon

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