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Three solid metallic spheres whose radii...

Three solid metallic spheres whose radii are 1cm, x cm and 8 cm, are melted and recast into a single solid sphere of diameter 18 cm. The surface area (in `cm^2`) of the sphere with radius x cm is :
तीन ठोस धात्विक गोले जिनकी त्रिज्याएँ 1 सेमी, x सेमी और 8 सेमी हैं, उन्हें पिघलाया जाता है और फिर 18 सेमी व्यास वाला एक ठोस गोला बनाया जाता है | उस गोले का पृष्ठ क्षेत्रफल (वर्ग सेमी में ) ज्ञात करें जिसकी त्रिज्या x सेमी थी |

A

`64 pi`

B

`100 pi`

C

`144 pi`

D

`72 pi`

Text Solution

Verified by Experts

The correct Answer is:
C
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