QUESTION IMAGE
Question
the volume of this cone is 392.5 cubic yards. what is the height of this cone?
round your answer to the nearest hundredth.
5 yd
h≈ 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 \( V = 392.5\) 立方码,\( r = 5\) 码,\(\pi\) 取 \( 3.14\)。
Step2: 代入数据求解\(h\)
将 \( V = 392.5\),\( r = 5\),\(\pi = 3.14\) 代入公式 \( 392.5=\frac{1}{3}\times3.14\times5^{2}\times h\)。
先计算 \( 5^{2}=25\),则式子变为 \( 392.5=\frac{1}{3}\times3.14\times25\times h\)。
再计算 \(\frac{1}{3}\times3.14\times25=\frac{78.5}{3}\),式子为 \( 392.5=\frac{78.5}{3}h\)。
两边同时乘以 \( 3\) 得 \( 392.5\times3 = 78.5h\),即 \( 1177.5 = 78.5h\)。
最后 \( h=\frac{1177.5}{78.5}=15.00\)。
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\(15.00\)