How to prove that in a triangle ,other than an equilateral triangle ,angle opposite the longest side is greater than 60 degree

How to prove that in a triangle ,other than an equilateral triangle ,a

1.	How to prove that in a triangle ,other than an equilateral triangle ,angle opposite the longest side is greater than 60 degree
Answer» How to prove that in a triangle ,other than an equilateral triangle ,angle opposite the longest side is greater than 60 degree