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Circle sector |
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| $$\textbf{Area of the circle sector}$$ | ||||||
| $$A = ½ · r^2 · \theta,$$ | ||||||
$$where \; \theta \; is \; in \; radian$$ | ||||||
| $$\textbf{Arc length}$$ | ||||||
| $$s = r · \theta,$$ | ||||||
| $$where \; \theta \; is \; in \; radian$$ | ||||||
| $$If \; \;\theta \; is \; in \; degree \; s = {\theta\over 360°} · 2 · \pi · r$$ | ||||||