A hemispherical tank has an inner diameter of 1.4 m. Find its capacity. (Take π = 22/7) (Rounded up to two decimal places)
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Correct answer: B
Explanation
The correct answer is option 2 i.e. 0.71 m3 .
Diameter = 1.4 m
Radius = 1.4 ÷ 2 = 0.7 m
Volume of hemisphere = (2/3) × π × r3
= (2/3) × (22/7) × (0.7)3
= (2/3) × (22/7) × 0.343
= (2/3) × (7.546 ÷ 7)
= (2/3) × 1.078
= 2.156 ÷ 3 = 0.71 m3