T.S.A of a solid hemisphere whose radius is x cm is 147 π cm^2. Then ‘x’ is (A) 21 (B) 15 (C) 8 (D) 7
T.S.A of a solid hemisphere whose radius is x cm is 147 π cm2. Then ‘x’ is
(A) 21
(B) 15
(C) 8
(D) 7
4 views
2 Answers
Correct option is: (D) 7
Radius of hemisphere is x cm.
\(\therefore\) Total surface area of the hemisphere = 3 \(\pi x^2\) \(cm^2\)
But given that T.S.A of hemisphere is 147\(\pi\) \(cm^2\).
\(\therefore\) 3\(\pi x^2\) = 147 \(\pi\)
= \(x^2 = \frac {147}3 = 49 = 7^2\)
\(\therefore\) x = 7
4 views
Answered