Question

The volume of a sphere whose surface area is 154cm2
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Answer 1

Answer:

GIVEN :

Surface area of sphere = 154 cm²

Surface area of sphere = 4πr²

154 = 4 ×(22/7) × r²

154 × 7 = 88r²

r² = (154×7) /88

r² = (7 × 7 )/4

r² = 49 /4

r = √49/4 = 7/2

r = 7/2 cm

Volume of Sphere = 4/3 πr³

=( 4/3) × (22/7) × (7/2)³

= 4/3 × 22/7 × (7/2) × (7/2) × (7/2)

= (22 × 7 × 7) /(3×2)

=( 22 × 49) / 6= 1078/6 = 179.66 cm³

Volume of Sphere = 179.66 cm³

Hence, the Volume of Sphere is 179.66 cm³.

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Answer 2

Answer:

vol. of a sphere = 4/3πr³

.....by this formula you can solve the question ...