18. The area of a square is numerically equal to five times its perimeter. What is the length of the side of the square?
A. 4 B. 10 C. 20 D. 40
A. 4 B. 10 C. 20 D. 40
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Answer:
C!
Step-by-step explanation:
16, 40, 80, 160 = Perimeter, respectively of the choices. (4a)
16, 100, 400, 1600 = Area, respectively of the choices. (a^2)
16/16 = 1 Time
100/40 = 2.5 Times
400/80 = ---5 Times its perimeter---
1600/160 = 10 Times
Length of the Square is 20