Question

find the the number of small iron spheres of radius 1.75cm which are making big iron sphere of radius 3.5cm
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Answer 1

Answer:

4.

Step-by-step explanation:

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Answer 2

Answer:

4 small sphere are made from that big sphere.

Step-by-step explanation:

Formula of area of sphere :

$area \: of \: sphere = \: 4\pi {r}^{2} \\ so \\ area \: of \: small \: sphere = 4 \times (22 \div 7) \times 1.75 \times 1.75 \\ = 38.5 {cm }^{2}$

$similarly \\ area \: of \: big \: sphere = 4 \times (22 \div 7) \times 3.5 \times 3.5 \\ = 154 {cm}^{2} \\ so \: the \: total \: number \: of \: small \: sphere = (154 \div 38.5) \\ = 4 \\ so \: the \: number \: of \: small \: sphere \: is \: 4.$

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