How to find the perimeter of a rectangle in pre-algebra

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Math › How to find the perimeter of a rectangle in pre-algebra

Questions 1 - 10
1

What is the perimeter of a rectangle with a base of and a height of ?

Explanation

To find the perimeter of a rectangle you must find the sum of all of the side lengths.

To do this we plug the base and height into the equation

With a base of and a height of our equation would look like

Multiply and add the numbers together

The answer is .

2

What is the perimeter of a rectangle with a base of and a height of ?

Explanation

To find the perimeter of a rectangle you must find the sum of all of the side lengths.

To do this we plug the base and height into the equation

With a base of and a height of our equation would look like

Multiply and add the numbers together

The answer is .

3

What is the perimeter of a rectangle with a base of and a height of ?

Explanation

To find the perimeter of a rectangle you must find the sum of all of the side lengths.

To do this, we plug the base and height into the equation .

With a base of and a height of our equation becomes .

Multiply and add the numbers together:

The answer is .

4

What is the perimeter of a rectangle with a base of and a height of ?

Explanation

To find the perimeter of a rectangle, find the sum of all of the side lengths using the equation:

Substitute the given values for base and height:

5

Calculate the perimeter of the polygon.

Number_1

Explanation

The perimeter is the sum of the length of all of the sides. We are given all of the side lengths in the figure, so we simply need to sum them together.

6

Find the perimeter of a rectangle with length 8 inches and width 10 inches.

Explanation

To find perimeter, add up all the sides. In a rectangle, there are 2 sets of identical sides so you can multiply the length by 2 and the width by 2 and combine them to get 36 inches.

7

Rectangle ABCD is subdivided into two identical square regions. If the area of each square is , what is the perimeter of ABCD ?

Explanation

Given that the area of each square is , the side length of each square is . To find the perimeter of the entire shape, one must add up the lenghts of the sides of the shape. Thus the sides of the rectangle are each , and the bases are (because the squares are connected). Adding them all together gives us .

8

A rectangle has a width of feet and a length of feet. What is the perimeter of the rectangle?

feet

square feet

square feet

feet

feet

Explanation

Recall that perimeter is the sum of all of the sides of a shape. Thus, we are adding up all sides of the rectangle. A rectangle has two sides that are the length and two sides that are the width. Thus,

feet.

Perimeter is a measure of length, and not area (or square feet), so our units are just feet.

9

What is the perimeter of a rectangle if the length is and the width is ?

Explanation

The perimeter of a rectangle is .

Plug in our given information to solve:

10

Find the perimeter of a rectangle with a length of 20 inches and a width of 12 inches.

Explanation

Add up all of the sides of the rectangle to get 64 inches.

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