The total surface area of a hemispher is 75(pi cm^2). Find the radius.
-
A.
5.0 cm -
B.
7.0 cm -
C.
8.5 cm -
D.
12.0 cm
Correct Answer: Option A
Explanation
Total surface area of hemisphere is
3(pi r^2) = 75(pi cm^2)
(r^2) = (frac{75 pi}{3 pi})
(r^2) = 25
r = (sqrt{25})
r = 5cm