Question

A triangle has sides A, B, and C. The angle between sides A and B is `(pi)/2`. If side C has a length of `9` and the angle between sides B and C is `pi/12`, what is the length of side A?

Answer 1

By the definition we get `a=BC=9sin(pi/12)`

Explanation:

In the right-angled triange we have `sin(pi/12)=a/c` and `sin(pi/12)=1/4sqrt(2)(sqrt(3)-1)`