Pi and Pythagorean triples
Geometry
Level
4
\[ \large \frac1{8\pi} \left( \sin^{-1} \left(\frac35\right) + \sin^{-1} \left(\frac{12}{13}\right) + \sin^{-1} \left(\frac{63}{65} \right) \right) = \ ? \]
by
Alisa Meier