# SSAT Elementary Level Math : How to find the perimeter of a rectangle

## Example Questions

### Example Question #221 : Parallelograms

What is the length of a rectangular room with a perimeter of  and a width of

Explanation:

We have the perimeter and the width, so we can plug those values into our equation and solve for our unknown.

Subtract  from both sides

Divide  by both sides

### Example Question #511 : Rectangles

Find the perimeter of the rectangle shown below:

Explanation:

The perimeter of a rectangle is all of the sides added together. When you have a rectangle the opposite sides are also the same lengths, so even when they aren't labeled you know the measurements of the other sides.

### Example Question #141 : How To Find The Perimeter Of A Rectangle

Use the following to answer the question.

Find the perimeter of the rectangle.

Explanation:

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

where a, b, c, and d are the lengths of each side of the rectangle.

When we look at the rectangle

we know that the length is 9ft and the width is 4ft.  Because it is a rectangle, we also know the lengths of the unmarked sides.  The unmarked sides are equal to the length of the opposite side.  So, we can substitute this into the formula.  We get

### Example Question #142 : How To Find The Perimeter Of A Rectangle

Find the perimeter of the rectangle.

A rectangle has a length of 12cm and a width of 4cm. What is the perimeter of this rectangle.

Explanation:

To find the perimeter of a rectangle, you must first understand that a rectangle's opposite sides are equal. Therefore if you know the length of one side it is the identical length of the opposite side.

### Example Question #143 : How To Find The Perimeter Of A Rectangle

Find the perimeter of a rectangle.

A rectangle has a width of 7cm and a length of 10cm. What is the perimeter of the rectangle?

Explanation:

First you need to understand that opposite sides of a rectangle are equal. Then you are able to add the value of each side to itself and then add your sums together to get the perimeter of a rectangle.

### Example Question #144 : How To Find The Perimeter Of A Rectangle

Use the following rectangle to answer the question:

Find the perimeter.

Explanation:

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

Where a, b, c, and d are the lengths of the sides of the rectangle.

Now, let's look at the rectangle.

We can see the length is 6in.  Because it is a rectangle, the opposite side is also 6in.

We can also see the width of the rectangle is 3in. Because it is a rectangle, the opposite side is also 3in.

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

### Example Question #145 : How To Find The Perimeter Of A Rectangle

Use the following rectangle to solve the problem:

Find the perimeter.

Explanation:

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

Where a, b, c, and d are the lengths of the sides of the rectangle.

Now, given the rectangle

we can see the length is 11in.  Because it is a rectangle, the opposite side is also 11in.

The width is 5in.  Because it is a rectangle, the opposite side is also 5in.

So, we can substitute.

### Example Question #521 : Rectangles

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

Explanation:

The formula for perimeter of a rectangle is

To solve for the width we can plug our known values into the equation.

Subtract  from both sides

Divide  by both sides

### Example Question #1386 : Common Core Math: Grade 4

What is the length of a room with a perimeter of  and a width of

Explanation:

We have the perimeter and the width, so we can plug those values into our equation and solve for our unknown.

Subtract  from both sides

Divide  by both sides

### Example Question #581 : Quadrilaterals

Emily is digging a garden in her backyard that is  meters long and  meters wide. What is the perimeter of her garden?