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Cirkelsector |
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| $$\textbf{Oppervlakte van de cirkelsector}$$ | ||||||
| $$A = ½ · r^2 · \theta,$$ | ||||||
$$waar \; \theta \; is \; in \; radialen$$ | ||||||
| $$\textbf{Boog lengte}$$ | ||||||
| $$s = r · \theta,$$ | ||||||
| $$waar \; \theta \; is \; in \; radialen$$ | ||||||
| $$Als \; \;\theta \; is \; in \; graden \; s = {\theta\over 360°} · 2 · \pi · r$$ | ||||||