Find the total surface area of a closed

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 2D

Question:

Find the total surface area of a closed hemisphere whose radius is 3.5 cm. (Use π=22/7)

Options:

114.5 cm²

113.5 cm²

115.5 cm²

112.5 cm²

Correct Answer:

115.5 cm²

Explanation:

We know that,

Total surface area of a closed hemisphere = 3πr²

Radius (r) of the hemisphere = 3.5 cm

According to the question,

= TSA = 3 × \(\frac{22}{7}\)× 12.25

= TSA = \(\frac{808.5}{7}\)= 115.5 cm²