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If the height of a right circular cylind...

If the height of a right circular cylinder is 10 cm, and its curved surface area is `440 cm^2`, then what is its radius ?
यदि किसी लम्ब वृतीय बेलन (सिलिंडर) की ऊंचाई 10 cm है, और उसका वक्र पृष्ठ क्षेत्रफल `440 cm^2` है, तो उसकी त्रिज्या कितनी है?

A

17.5 cm

B

10.5 cm

C

14 cm

D

7 cm

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