Wednesday, April 17, 2013

Perimeter of a square



This is part 2 of our video series on finding the perimeter of plane shapes. Here is a formula sheet for finding the perimeter of plane shapes Perimeter formulas plane shapes

The formula for finding the perimeter of a square is four times one side or 4s
Problem 1  What is the perimeter of a square that has a side of 8 units?
Step 1. 4*8 =32 units
Problem 2 What is the perimeter of a square in which you only know the diagonal length of 10 units.
Step 1. Inside a square you have a 45-45-90 right triangle. Therefore you use the 45-45-90 rule to find the length of one side.

Step 2  Then to find the perimeter multiply 4 times five square root two, which equals twenty square root two.