User talk:EAi/Test

$$               2 \times p \times p \times sin(angle) = angle \times r \times r\, $$

$$               \frac{p\times p}{r\times r} = \frac{angle}{2\times sin(angle)} $$

$$               \frac{p}{r} = \sqrt\frac{angle}{2\times sin(angle)} $$