How Do You Find the Perimeter and Area of a Rectangle?
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Now, let’s learn how to find the perimeter and area of rectangles. A rectangle is a quadrilateral where all the angles are , and where parallel sides have the same length as each other.
Rule
Rectangle
A rectangle is a quadrilateral where all the angles are .
In a rectangle, parallel sides have the same length.
Perimeter of a Rectangle
You can find the perimeter of a rectangle by adding the lengths of all four sides together. Because each set of parallel sides has the same length as each other, you can use the formula below. We call length and width .
Formula
Perimeter of a Rectangle
Example 1
Find the perimeter of the rectangle
You plug the numbers into the formula above and get
The perimeter of the rectangle is cm.
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Want to watch animated videos and solve interactive exercises about finding the area of rectangles?
Click here to try Video Crash Courses called “Quadrilaterals”!
Area of a Rectangle
You can find the area of a rectangle by multiplying the width and the length of the rectangle. Like before, we call the width and the length .
Formula
Area of a Rectangle
Example 2
Find the area of the rectangle
By putting the numbers into the formula above, you get:
The area of the figure is cm2.
