math volumeee
2009-06-11 3:52 am
the circumference of the falt surface of a hemisphere is 137cm.find the curved surface area of the hemisphere.............
回答 (1)
2009-06-11 4:50 am
✔ 最佳答案
the circumference of the falt surface of a hemisphere is 137cm :2πr = 137 , r = 137 / 2π
the curved surface area of the hemisphere = 2πr^2
= 2π(137 / 2π)^2
= 137^2 / 2π
= 2987.17912... = 2987.18cm^2 (2 dec.)
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