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Question
hector is finding the volume of a cone and the volume of a cylinder. both the cone and the cylinder have a radius of 3 inches and a height of 5 inches. what is the volume, in cubic inches, of the cone? 15π 36π 45π 25π what is the ratio of the cones volume to the cylinders volume? 3/1 2/3 1/3
Step1: 圆锥体积公式
圆锥体积公式为\(V_{cone}=\frac{1}{3}\pi r^{2}h\),其中\(r = 3\)英寸,\(h = 5\)英寸。
Step2: 代入计算
将\(r = 3\),\(h = 5\)代入公式,\(V_{cone}=\frac{1}{3}\pi\times3^{2}\times5\)。
先计算\(3^{2}=9\),则\(V_{cone}=\frac{1}{3}\pi\times9\times5\)。
\(\frac{1}{3}\times9 = 3\),所以\(V_{cone}=3\times5\pi=15\pi\)。
Step3: 圆柱体积公式
圆柱体积公式\(V_{cylinder}=\pi r^{2}h\),\(r = 3\),\(h = 5\),则\(V_{cylinder}=\pi\times3^{2}\times5 = 45\pi\)。
Step4: 求体积比
圆锥体积与圆柱体积比为\(\frac{V_{cone}}{V_{cylinder}}=\frac{15\pi}{45\pi}\),\(\pi\)约掉,\(\frac{15}{45}=\frac{1}{3}\)。
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圆锥体积为\(15\pi\),圆锥体积与圆柱体积比为\(\frac{1}{3}\)。即第一个空选\(15\pi\),第二个空选\(\frac{1}{3}\)。