Help With This Problem Plz.......?

Question

Three sides of triangle are a, b, c., corresponding interior angles are A, B, C, and its circumradius is R, Pleaze tell me why the equation below is right:
(a/sinA)+(b/sinB)+(c/sinC)=6R

Thanks a lot!!!

thank you. I'm too old to remember that simple high school knowledge*blush*

Answer 1

The Law of Sines says that:

(a/sinA) = (b/sinB) = (c/sinC) = 2R

So the sum of them = 3*(2R) = 6R