QUESTION IMAGE
Question
the volume of this cone is 769.3 cubic centimeters. what is the radius of this cone?
round your answer to the nearest hundredth.
15 cm
r ≈ centimeters
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 \( V = 769.3\) 立方厘米,\( h=15\) 厘米,\(\pi\) 取 \( 3.14\)。
Step2: 代入已知值求解 \( r^{2}\)
将值代入公式 \( 769.3=\frac{1}{3}\times3.14\times r^{2}\times15\),
先计算 \(\frac{1}{3}\times3.14\times15 = 15.7\),
则方程变为 \( 769.3 = 15.7r^{2}\),
两边同时除以 \( 15.7\) 得 \( r^{2}=\frac{769.3}{15.7}=49\)。
Step3: 求解 \( r\)
因为 \( r^{2}=49\),所以 \( r=\sqrt{49}=7.00\)(厘米)。
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\( 7.00\) 厘米