The total surface area of a hemisphere i

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 3D

Question:

The total surface area of a hemisphere is 27 \(\pi \) cm², then the radius of the base of the hemisphere is -

Options:

7 cm

5 cm

4 cm

3 cm

Correct Answer:

3 cm

Explanation:

T.S.A. of a hemisphere = 3\(\pi \)r²

⇒ 27\(\pi \) = 3\(\pi \)r²

⇒ r² = 9

⇒ r = 3 cm