What rule would be used to find the length of sides if all three angles are known?


There is an infinite number of similar triangles that have the same angles. Imagine if you have a triangle and you know all the angles. You can keep making it bigger, but the angles stay the same. However, the sides get longer. So you need to know the length of at least one side. Then you can use the Sine Rule to work out the remaining three sides.

Updated on March 23, 2018

Original Article:

How to Calculate the Sides and Angles of Triangles
By Eugene Brennan