| Exam Board | OCR MEI |
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| Module | C1 (Core Mathematics 1) |
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| Year | 2011 |
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| Session | January |
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| Topic | Quadratic Functions |
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5 The volume \(V\) of a cone with base radius \(r\) and slant height \(l\) is given by the formula
$$V = \frac { 1 } { 3 } \pi r ^ { 2 } \sqrt { l ^ { 2 } - r ^ { 2 } }$$
Rearrange this formula to make \(l\) the subject.