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April 19, 2014

Homework Help: Math 7 - HW Question Check (Q3)

Posted by Laruen on Sunday, April 15, 2012 at 6:52pm.

Kevin designs sprinkler system for his yard. One rotation of the sprinkler waters a circle with an area of 225(pi) square feet. What is the radius, r, of the circle the rotating sprinkler waters?
a) 15 ft
b) 25 ft
c) 30 ft
d) 47 ft
Answer - A
Why?:
A = (pi) x r(2 to the second power)
A = 225 x 15 (2 to the second power)
15 x 15 = 225

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