Question

What is the value of S

Answer 1

Since the shape of the polygon is a square, all 4 sides have the exact same length. This means that Perimeter = 4 * length of one side, or;
$P = 4 s\\ 20=4s\\ s=\frac{20}{4}=5$
Thus, the length(value) of S is 5.

Answer 2

The answer is 5 because if you ad 5+5+5+5=20 it equald 20