Perimeter of Polygons - SSAT Upper Level Quantitative (Math)

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Question

A regular hexagon has perimeter 9 meters. Give the length of one side in millimeters.

Answer

One meter is equal to 1,000 millimeters, so the perimeter of 9 meters can be expressed as:

9 meters = millimeters.

Since the six sides of a regular hexagon are congruent, divide by 6:

millimeters.

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Question

A regular hexagon has perimeter 15 feet. Give the length of one side in inches.

Answer

As the six sides of a regular hexagon are congruent, we can write:

feet; is the length of each side.

One feet is equal to 12 inches, so we can write:

inches

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Question

A hexagon with perimeter 60 has four congruent sides of length . Its other two sides are congruent to each other. Give the length of each of those other sides in terms of .

Answer

The perimeter of a polygon is the sum of the lengths of its sides. Let:

Length of one of those other two sides

Now we can set up an equation and solve it for in terms of :

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Question

Two sides of a hexagon have a length of , two other sides have the length of , and the rest of the sides have the length of . Give the perimeter of the hexagon.

Answer

The perimeter of a polygon is the sum of the lengths of its sides. So we can write:

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Question

Each interior angle of a hexagon is 120 degrees and the perimeter of the hexagon is 120 inches. Find the length of each side of the hexagon.

Answer

Since each interior angle of a hexagon is 120 degrees, we have a regular hexagon with identical side lengths. And we know that the perimeter of a polygon is the sum of the lengths of its sides. So we can write:

inches

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Question

A hexagon with perimeter of 48 has three congruent sides of . Its other three sides are congruent to each other with the length of . Find .

Answer

The perimeter of a polygon is the sum of the lengths of its sides. Since three sides are congruent with the length of and the rest of the sides have the length of we can write:

Now we should solve the equation for :

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Question

A regular pentagon has sidelength one foot; a regular hexagon has sidelength ten inches. The perimeter of a regular octagon is the sum of the perimeters of the pentagon and the hexagon. What is the measure of one side of the octagon?

Answer

A regular polygon has all of its sides the same length. The pentagon has perimeter ; the hexagon has perimeter . The sum of the perimeters is , which is the perimeter of the octagon; each side of the octagon has length .

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Question

Find the perimeter of a hexagon with a side length of .

Answer

A hexagon has six sides. The perimeter of a hexagon is:

Substitute the side length.

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Question

The base length of a parallelogram is 10 inches and the side length is 6 inches. Give the perimeter of the parallelogram.

Answer

Like any polygon, the perimeter of a parallelogram is the total distance around the outside, which can be found by adding together the length of each side. In case of a parallelogram, each pair of opposite sides is the same length, so the perimeter is twice the base plus twice the side length. Or as a formula we can write:

Where:

is the base length of the parallelogram and is the side length. So we can write:

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Question

The base length of a parallelogram is which is two times more than its side length. Give the perimeter of the parallelogram in terms of .

Answer

The side length is half of the base length:

The perimeter of a parallelogram is:

Where:

is the base length of the parallelogram and is the side length

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Question

The base length of a parallelogram is . If the perimeter of the parallelogram is 24, give the side length in terms of .

Answer

Let:

Side length .

The perimeter of a parallelogram is:

where:

is the base length of the parallelogram and is the side length. The perimeter is known, so we can write:

Now we solve the equation for :

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Question

The side length of a parallelogram is and the base length is three times more than side length. Give the perimeter of the parallelogram in terms of .

Answer

The base length is three times more than the side length, so we have:

Base length

The perimeter of a parallelogram is:

Where:

is the base length of the parallelogram and is the side length. So we get:

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Question

The base length of a parallelogram is identical to its side length. If the perimeter of the parallelogram is 40, give the base length.

Answer

The perimeter of a parallelogram is:

Where:

is the base length of the parallelogram and is the side length. In this problem the base length and side length are identical, that means:

So we can write:

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Question

The base length of a parallelogram is and the side length is . Give the perimeter of the parallelogram in terms of and calculate it for .

Answer

The perimeter of a parallelogram is:

where:

is the base length of the parallelogram and is the side length. So we have:

and:

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Question

Parallelogram1

The above parallelogram has area 100. Give its perimeter.

Answer

The height of the parallelogram is , and the base is . By the Theorem, . Since the product of the height and the base of a parallelogram is its area,

By the Theorem,

, and

The perimeter of the parallelogram is

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Question

Parallelogram2

Give the perimeter of the above parallelogram if .

Answer

By the Theorem:

, and

The perimeter of the parallelogram is

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Question

A pentagon with perimeter 54 has three congruent sides of length ; its other two sides are congruent to each other. Give the length of each of those other two sides in terms of .

Answer

The perimeter of a polygon is the sum of the lengths of its sides. If we let be the length of one of those other two sides, we can set up this equation and solve for :

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Question

A regular pentagon has perimeter 7 meters. Give the length of one side in millimeters.

Answer

One meter is equal to 1,000 millimeters, so the perimeter of 7 meters can be expressed as:

7 meters = millimeters.

Since the five sides of a regular pentagon are congruent, divide by 5:

millimeters.

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Question

A regular pentagon has perimeter 42 meters. What is the length of one side in centimeters?

Answer

One meter is equal to 100 centimeters, so the perimeter of 42 meters can be expressed as follows:

meters centimeters

In a regular pentagon, all sides are equal in length. Divide the perimeter by 5 to get the length of each side:

centimeters

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Question

The perimeter of a pentagon is . The pentagon has three congruent sides of length meters. Its other two sides are congruent to each other, each with a length of .

Find .

Answer

The perimeter of a polygon is sum of the lengths of its sides. In this pentagon, three sides have the same length of 4 and two others have the same length of . So we can write:

Now we should solve this equation for :

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