# sin-coop rule

## Problem 01 | Right Spherical Triangle

**Problem**

Solve for the spherical triangle whose parts are a = 73°, b = 62°, and C = 90°.

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## Right Spherical Triangle

**Solution of right spherical triangle**

With any two quantities given (three quantities if the right angle is counted), any right spherical triangle can be solved by following the Napier’s rules. The rules are aided with the Napier’s circle. In Napier’s circle, the sides and angle of the triangle are written in consecutive order (not including the right angle), and complimentary angles are taken for quantities opposite the right angle.

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