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in Mensuration by (35.6k points)
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A metallic sphere of radius 2 cm is melted to recast into the shape of a cylinder of radius 4 cm. Then the height of the cylinder is

A) 1/3 cm

B) 4/3 cm

C) 2/3 cm

D) 1 cm

2 Answers

+2 votes
by (66.4k points)
selected by
 
Best answer

Correct option is: C) \(\frac{2}{3}\) cm

Volume of cylinder = volume of the sphere.

\(\pi r^2h = \frac 43 \pi r^3\) 

\(4 \times 4 \times h = \frac 43 \times 2 \times 2 \times 2\).

= h = \(\frac {16}3 \times \frac2{16} = \frac 23\)

Hence, the height of the cylinder is \(\frac 23\)cm

+1 vote
by (34.5k points)

Correct option is: C) \(\frac{2}{3}\) cm

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