Hole Radius of a torus formula |
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| R_h \;=\; R - r | ||
| Symbol | English | Metric |
| R_h = radius of the hole | in | mm |
| r = radius of sphere | in | mm |
| R = radius of center of sphere | in | mm |
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Torus (a three-dimensional figure) has a shape like a donut.
Surface Area of a torus formula |
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| S \;=\; 4 \cdot \pi^2 \cdot R \cdot r | ||
| Symbol | English | Metric |
| S = surface area | in^2 | mm^2 |
| \pi = Pi | 3.141 592 653 ... | 3.141 592 653 ... |
| r = radius of sphere | in | mm |
| R = radius of center of sphere | in | mm |
Volume of a torus formula |
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| V \;=\; 2 \cdot \pi^2 \cdot R \cdot r^2 | ||
| Symbol | English | Metric |
| V = volume | in^3 | mm^3 |
| \pi = Pi | 3.141 592 653 ... | 3.141 592 653 ... |
| r = radius of sphere | in | mm |
| R = radius of center of sphere | in | mm |