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Various functions and equalities
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| no. | Description | Equation |
| 1 | solution of squared equation |  |
| 2 | equation of an ellipse |  |
| 3a | surface area of circle (radius r, or diameter d) |
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| 3b | perimeter of circle (radius r, or diameter d) |
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| 4a | volume of sphere (radius r, or diameter d) |
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| 4b | surface area of sphere (radius r, or diameter d) |
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