The Law of Sines


The Law of Sines


The Law of Sines is the relationship between sides and angles in any triangle.



Introduction

Let's prove the theorem.

(Hints)

MENU1...If a sinB = b sinA, you can make a triangle.

MENU2...If a triangle exists, always a sinB = b sinA.

MENU3...Let R be the radius of the circumscribed circle of triangle ABC, then 2RsinC = c.
Drag the red point