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A hemisphere of radius 30 cm is moulded ...

A hemisphere of radius 30 cm is moulded to form a cylinder of height 180 cm. The diameter of the cylinder is:
30 सेमी त्रिज्या वाले एक अर्धगोले को पिघलाकर 180 सेमी ऊंचाई वाला एक बेलन बनाया जाता है | इस बेलन का व्यास है:

A

15 cm

B

10 cm

C

5 cm

D

20 cm

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