Write a c program to check whether a triangle is valid or not | Let Us C

https://www.easterscience.com/q7-write-a-program-to-check-whether-a-triangle-is-valid-or-not-when-the-three-angles-of-the-triangle-are-entered-through-the-keyboard-a-triangle-is-valid-if-the-sum-of-all-the-three-angles-is-equal/