QUESTION IMAGE
Question
the volume of this cone is 461.58 cubic yards. what is the radius of this cone?
round your answer to the nearest hundredth.
9 yd
r ≈ yards
Step1: 写出圆锥体积公式
圆锥体积公式为 \( V=\frac{1}{3}\pi r^{2}h\),已知 \( V = 461.58\) 立方码,\( h=9\) 码,\(\pi\) 取 \( 3.14\)。
Step2: 代入已知值求解 \(r^{2}\)
将 \(V = 461.58\),\(h = 9\),\(\pi=3.14\) 代入公式 \(461.58=\frac{1}{3}\times3.14\times r^{2}\times9\)。
先计算 \(\frac{1}{3}\times3.14\times9 = 9.42\),则方程变为 \(461.58 = 9.42r^{2}\)。
两边同时除以 \(9.42\),得到 \(r^{2}=\frac{461.58}{9.42}=49\)。
Step3: 求解 \(r\)
因为 \(r^{2}=49\),所以 \(r=\sqrt{49}= 7\)(\(r>0\),半径不能为负)。
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