Hard Math Class 9 Level 3

The curved surface area of a cylinder is 660 cm² and radius is 7 cm. What is its height?

बेलन का वक्र पृष्ठीय क्षेत्रफल 660 cm² और त्रिज्या 7 cm है। ऊंचाई कितनी होगी?

Show answer and explanation

Correct Answer

B. 15 cm / 15 cm

Explanation

Using 2πrh = 660 with r = 7 gives 44h = 660 so h = 15 cm.

2πrh = 660 में r = 7 रखने पर 44h = 660 इसलिए h = 15 cm।

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