Question

Secuon
Numerical Ability i
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The total surface area of a solid hemisphere is 75 times the area of a circle whose diameter is 6 cm. What is
the radius (in cm) of the hemisphere?
O 501
O 100
O 80
O 1207​

Answer 1

Answer:

r = 30 cm

Step-by-step explanation:

S.A. of a sphere is 2πr²

S.A. of a solid sphere is 2πr² + πr² = 3πr²

3πr² = 75 × π × 6² .... (1)

(1) ÷ 3π

r² = 25 × 6² = (5×6)²

r = 30 cm