Question

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 ​

Answer 1

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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