Answers

2016-02-24T16:41:59+05:30
TSA OF A HEMISPHERE = 3πr²
3πr²=462
3×22/7×r²=462
66/7r²=462
r²=462×7/66
r²=49
r=√49=7

volume of hemisphere = 2/3πr³
2/3×22/7×7×7×7=

718.6cm³

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2016-02-24T16:51:26+05:30
Let r = radius of solid hemisphere 
Total surface area of hemisphere 462 cm²
⇒3 pie r² = 462 ⇒ 3 ₓ 22/7 ₓ r² = 462 ⇒ r²  = 462 ₓ 73 ₓ 22 ⇒ r² =49 ⇒ r = 7 cm now, volume of hemisphere = 23 pie r3 = 43 ₓ 22/7 ₓ 73 = 23 ₓ 22/7 ₓ 7 ₓ 7 ₓ 7 = 44 ₓ 43 9 = 718.67 cm 3
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