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# Perimeter: Find the missing side

Look at this square. Find the value of z. Perimeter = 64 yards

You find the perimeter by adding the lengths of the edges.

In a square, all four sides are the same length.

Add the lengths of the sides:

z+z+z+z=64

4z=64

Divide both sides by 4:

z=16

Now look for the units. The units are yards.

z=16 yards.

Look at this triangle. Find the value of z         16 ft     z    12 ft   Perimeter = 42

The perimeter is ft