The curved surface area and the height o

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 3D

Question:

The curved surface area and the height of a right circular cylinder are 660 cm² and 10 cm respectively. Find its diameter (in cm).

Options:

20 cm

19 cm

21 cm

22 cm

Correct Answer:

21 cm

Explanation:

The curved surface area of right circular cylinder = 2\(\pi \)rh

2\(\pi \)r × 10 = 660

r = \(\frac{660 × 7}{2 × 10 × 22}\)

r = 10.5cm

Diameter = 2r = 2 × 10.5 = 21 cm