空心圆柱体体积计算器(从直径和高度)

TechOverflow calculators:
You can enter values with SI suffixes like 12.2m (equivalent to 0.012) or 14k (14000) or 32u (0.000032).
The results are calculated while you type and shown directly below the calculator, so there is no need to press return or click on a Calculate button.
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$$V = \pi\cdot(\frac{OD}{2})²\cdot h\ -\ \pi\cdot(\frac{ID}{2})²\cdot h$$
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