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A right circular solid cone of radius 3.2 cm and height 7.2 cm is melted and recast into a right circular cylinder of height 9.6 cm. What is the diameter of the base of the cylinder ?
3.2 सेमी त्रिज्या और 7.2 सेमी ऊंचाई वाले एक लम्ब वृत्तीय ठोस शंकु को पिघलाया जाता है तथा 9.6 सेमी ऊँचाई वाला एक लम्ब वृत्तीय बेलन बनाया जाता है | बेलन के आधार का व्यास कितना है ?

A

4.2 cm

B

4.5 cm

C

3.5 cm

D

3.2 cm

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