How do you find the perimeter of a rectangle if the perimeter is 80?

P = 2 (l + w)

Perimeter: Add the length of the four sides.Area: Multiply length x width.

Add up the lengths of all the sides. Since there are two pair of equal sides, just take each the length and double it and then the width and double it. Now add those two numbers. If the length is L...

Use the following formulae:Area = length x width Perimeter = 2 x length plus 2 x width, or length + length + width + width

2*(base) + 2*(height) = perimeter