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a cylinder has a height of 3 centimeters. its volume is 339.12 cubic ce…

Question

a cylinder has a height of 3 centimeters. its volume is 339.12 cubic centimeters. what is the radius of the cylinder? round your answer to the nearest hundredth. r ≈ centimeters submit

Explanation:

Step1: 写出圆柱体积公式

圆柱体积公式为 \(V=\pi r^{2}h\),其中 \(V\) 是体积,\(r\) 是半径,\(h\) 是高。已知 \(V = 339.12\) 立方厘米,\(h=3\) 厘米,\(\pi\) 取 \(3.14\)。

Step2: 代入已知值求解 \(r^{2}\)

将 \(V = 339.12\),\(h = 3\),\(\pi=3.14\) 代入公式 \(V=\pi r^{2}h\),得到 \(339.12=3.14\times r^{2}\times3\)。
先计算 \(3.14\times3 = 9.42\),则方程变为 \(339.12 = 9.42r^{2}\)。
两边同时除以 \(9.42\),\(r^{2}=\frac{339.12}{9.42}=36\)。

Step3: 求解 \(r\)

因为 \(r^{2}=36\),所以 \(r=\sqrt{36}=6\)(\(r>0\),半径不能为负)。

Answer:

\(6\)