1.If the total surface area of a soild hemisphere is 245兀cm^2, find its volume
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2007-12-07 3:21 am
回答 (2)
2007-12-07 3:28 am
✔ 最佳答案
Let the radius be r cm the total surface area of a soild hemisphere is 245πcm^2
4πr^2/2+πr^2=245π
3πr^2=245π
3r^2=245
r^2=245/3
r~9.04cm
Therefore,its volume
=(4/3πr^3)/2
=[4/3π(9.04)^3]/2
=1550cm^3
2007-12-07 3:28 am
兀r^2+ 2兀r^2 =245兀
so 3兀r^2=245兀
so r =開方 (245/3)
then volume = 4/3 x 兀x r^3x1/2
Volume =1550cm^3
so 3兀r^2=245兀
so r =開方 (245/3)
then volume = 4/3 x 兀x r^3x1/2
Volume =1550cm^3
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