the are of a square is numerically equal to five times its perimeter. Find the length of the square
a. 20
b. 10
c. 4
d. 40
Answers
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area of a square = s^2
perimeter of square = 4s
where s is side.
area = 5 ( perimeter )
s^2 = 5 ( 4s )
s^2 = 20s
s x s = 20 s
s = 20 s / s
s = 20
so answer is (a) 20.
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