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

Math 7 - HW Question Check (Q3) - Damon, Sunday, April 15, 2012 at 6:55pm
pi r^2 = 225 pi
r^2 = 225
r = 15
Math 7 - HW Question Check (Q3) - Laruen, Sunday, April 15, 2012 at 6:58pm
im correct :)

thanks

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