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Lifetrance (talk | contribs) m →Formulae: add name for missing term. |
Lifetrance (talk | contribs) Add apothem formulae |
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The [[Sagitta_(geometry)|sagitta]] is
:<math>h =R-\sqrt{R^2-\frac{c^2}{4}}= R(1-\cos\tfrac{\theta}{2})=R\left(1-\sqrt{\tfrac{1+\cos\theta}{2}}\right)=\frac{c}{2}\tan\frac{\theta}{4}</math>
The [[apothem]] is
:<math> d = R - h = \sqrt{R^2-\frac{c^2}{4}} = R\cos\tfrac{\theta}{2} </math>
=== Arc length and area ===
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