Look at this square. Find the value of a.

Answer:
18
Step-by-step explanation:
A square has 4 sides of equal length.
The perimeter of the square is the sum of the lengths of the sides of the square.
P = perimeter; a = length of 1 side
P = a + a + a + a
P = 4a
We are told the perimeter is 72 yd.
4a = 72 yd
Divide both sides by 4.
a = 72/4 yd
a = 18 yd
Answer: 18