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ISEE Upper Level Math : Plane Geometry

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Example Questions

Example Question #1 : Hexagons

What is the sidelength, in feet and inches, of a regular hexagon with perimeter 16 feet?

Possible Answers:

$3 \textrm{ ft }2 \frac{2}{5} \textrm{ in}$

$2 \textrm{ ft }$

$2 \textrm{ ft }8 \textrm{ in}$

$1 \textrm{ ft }7 \frac{1}{5} \textrm{ in}$

$1 \textrm{ ft }4 \textrm{ in}$

Correct answer:

$2 \textrm{ ft }8 \textrm{ in}$

Explanation:

Divide the perimeter 16 feet by 6 to get the sidelength of the hexagon in feet:

$16 \div 6 = 2\frac{2}{3} \textrm{ ft }$

Two-thirds of a foot is equal to eight inches, so this sidelength is 2 feet 8 inches.

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Example Question #2 : Hexagons

The perimeter of a regular hexagon is one mile. Give the sidelength in feet.

Possible Answers:

$330 \textrm{ ft}$

$660 \textrm{ ft}$

$990 \textrm{ ft}$

$880 \textrm{ ft}$

$1,320 \textrm{ ft}$

Correct answer:

$880 \textrm{ ft}$

Explanation:

One mile is equal to 5,280 feet, so divide this by 6:

$5,280 \div 6 = 880$ feet

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Example Question #1 : Plane Geometry

A hexagon has a perimeter of 114in. Find the length of one side.

Possible Answers:

$19\text{in}$

$12\text{in}$

$17\text{in}$

$22\text{in}$

$20\text{in}$

Correct answer:

$19\text{in}$

Explanation:

A hexagon has 6 equal sides. The formula to find perimeter of a hexagon is:

P = 6a

where a is the length of any side. Now, to find the length of one side, we will solve for a.

We know the perimeter of the hexagon is 114in. So, we will substitute and solve for a. We get

$114\text{in} = 6a$

$\frac{114\text{in}}{6} = \frac{6a}{6}$

$19\text{in} = a$

$a = 19\text{in}$

Therefore, the length of one side of the hexagon is 19in.

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Example Question #2 : Geometry

The perimeter of a hexagon is 96cm. Find the length of one side.

Possible Answers:

$14\text{cm}$

$16\text{cm}$

$19\text{cm}$

$18\text{cm}$

$13\text{cm}$

Correct answer:

$16\text{cm}$

Explanation:

A hexagon has 6 equal sides. To find the length of one side of a hexagon, we will use the formula to find the perimeter.

P = 6a

where a is the length of one side. So, we will solve for a.

Now, we know the perimeter of the hexagon is 96cm. So, we get

$96\text{cm} = 6a$

$\frac{96\text{cm}}{6} = \frac{6a}{6}$

$16\text{cm} = a$

$a = 16\text{cm}$

Therefore, the length of one side of the hexagon is 16cm.

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Example Question #3 : Plane Geometry

If the sum of angles in a hexagon is equal to $650^\circ$ , what is the value of the remaining sixth angle?

Possible Answers:

$70^\circ$

$100^\circ$

$80^\circ$

$60^\circ$

Correct answer:

$70^\circ$

Explanation:

The sum of the angles in a polygon can be found using the equation below, in which t is equal to the total sum of the angles, and n is equal to the number of sides.

t=(n-2)(180)

Given that a hexagon has 6 angles, the total number of angles will be:

t=(6-2)(180)

$t=4\cdot 180$

t=720

Given that 5 of the angles have a sum of 650 degrees, we would subtract 650 from 720, resulting in 70 degrees.

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Example Question #3 : Hexagons

Find the perimeter of a hexagon with one side having a length of 15cm.

Possible Answers:

$135\text{cm}$

$105\text{cm}$

$90\text{cm}$

$75\text{cm}$

$120\text{cm}$

Correct answer:

$90\text{cm}$

Explanation:

To find the perimeter of a hexagon, we will use the following formula:

$P = 6 \cdot a$

where a is the length of one side of the hexagon.

Now, we know the length of one side of the hexagon is 15cm.

Knowing this, we can substitute into the formula. We get

$P = 6 \cdot 15\text{cm}$

$P = 90\text{cm}$

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Example Question #3 : Plane Geometry

Find the perimeter of a hexagon with a side having a length of 13cm.

Possible Answers:

$78\text{cm}$

$91\text{cm}$

$76\text{cm}$

$104\text{cm}$

$65\text{cm}$

Correct answer:

$78\text{cm}$

Explanation:

A hexagon has 6 sides. So, to find the perimeter, we will use the following formula:

P = 6a

where a is the length of one side.

Now, we know a side has a length of 13cm. Knowing this, we can substitute into the formula.

$P = 6 \cdot 13\text{cm}$

$P = 78\text{cm}$

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Example Question #2 : Isee Upper Level (Grades 9 12) Mathematics Achievement

A hexagon has a side of length 13cm. Find the perimeter.

Possible Answers:

$78\text{cm}$

$91\text{cm}$

$52\text{cm}$

$65\text{cm}$

$104\text{cm}$

Correct answer:

$78\text{cm}$

Explanation:

To find the perimeter of a hexagon, we will use the following formula:

P = 6a

where a is the length of one side of the hexagon. We multiply it by 6 because a hexagon has 6 equal sides.

So, we know the length of one side is 13cm. Knowing this, we can substitute into the formula. We get

$P = 6 \cdot 13\text{in}$

$P = 78\text{in}$

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

Find the perimeter of a hexagon with a side having a length of 12in.

Possible Answers:

$84\text{in}$

$72\text{in}$

$108\text{in}$

$96\text{in}$

$60\text{in}$

Correct answer:

$72\text{in}$

Explanation:

To find the perimeter of a hexagon, we will use the following formula:

$P = 6 \cdot a$

where a is the length of one side of the hexagon. Because a hexagon has 6 equal sides, we can use any side in the formula.

So, we know the length of one side is 12in. So, we can substitute. We get

$P = 6 \cdot 12\text{in}$

$P = 72\text{in}$

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Example Question #1 : Hexagons

Find the perimeter of a hexagon if it contains a side having a length of 17cm.

Possible Answers:

$102\text{cm}$

$153\text{cm}$

$119\text{cm}$

$136\text{cm}$

$85\text{cm}$

Correct answer:

$102\text{cm}$

Explanation:

To find the perimeter of a hexagon, we will use the following formula:

$P = 6 \cdot a$

where a is the length of one side of the hexagon.

Now, we know the length of one side of the hexagon is 17cm.

Knowing this, we can substitute into the formula. We get

$P = 6 \cdot 17\text{cm}$

$P = 102\text{cm}$

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All ISEE Upper Level Math Resources

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ISEE Upper Level Math : Plane Geometry

Study concepts, example questions & explanations for ISEE Upper Level Math

All ISEE Upper Level Math Resources

Example Questions

Example Question #1 : Hexagons

Example Question #2 : Hexagons

Example Question #1 : Plane Geometry

Example Question #2 : Geometry

Example Question #3 : Plane Geometry

Example Question #3 : Hexagons

Example Question #3 : Plane Geometry

Example Question #2 : Isee Upper Level (Grades 9 12) Mathematics Achievement

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

Example Question #1 : Hexagons

All ISEE Upper Level Math Resources

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