# Law of sines

- Author:
- Francisco Quezada Campos

- Topic:
- Sine

The purpose of this presentation is to guide students to build, step by step, a triangle to:
(1) Check the law of sines in some particular cases and (2) Show that by inscribing the triangle inside
a circle, twice the distance (2r) of the center of the circle to any of the triangle is equal to the length
of any side of the triangle (a, b or c) divided by the sine of the opposite angle.