知面积,求体积.

来源：百度知道 编辑：UC知道 时间：2024/06/30 13:29:52
the surface area of a hemisphere is 1848cm2 .find it's volume.
谢谢.
把π取作7分之22.谢谢大家了.

hemisphere的意思是半球！
S=4*3.14*R2/2，代入数据解出R=17，V=4*3.14*R3/3=10564cm2

the surface area formula of a hemisphere is S = 3pi * r^2

the volume formula of that is V = 4/3 pi * r^3

so

r = sqrt(S/(3pi)) = sqrt(616/pi)

V = 4/3 pi * r^3 = 2464/3 sqrt(616/pi)

4*22/7*r*r=1848
1848*7=4*22*r*r
12936=88*r2
r=12936/88
r=147
r=12.12
2/3*22/7*12.124*12.124*12.124=V
V=3734.3cm2

球形吗？

还是英语的？？英语不好

hemisphere的意思是半球！
S=4*3.14*R2/2，代入数据解出R=17.1499，
V=2*3.14*R3/3=2.4*10^3cm3