QUESTION IMAGE
Question
a cone has a height of 12 millimeters and a radius of 9 millimeters. what is its volume? round your answer to the nearest hundredth. cubic millimeters
Step1: 写出圆锥体积公式
圆锥体积公式为\(V=\frac{1}{3}\pi r^{2}h\),其中\(r\)是底面半径,\(h\)是高。
Step2: 代入数值计算
已知\(r = 9\)毫米,\(h = 12\)毫米,代入公式可得:
\(V=\frac{1}{3}\times\pi\times9^{2}\times12\)
先计算\(9^{2}=81\),则\(V=\frac{1}{3}\times\pi\times81\times12\)。
\(\frac{1}{3}\times81 = 27\),所以\(V=27\times\pi\times12\)。
\(27\times12 = 324\),则\(V = 324\pi\)。
取\(\pi\approx3.14159\),\(V\approx324\times3.14159\)。
\(324\times3.14159 = 1017.87516\)。
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\(1017.88\)