Question

I’m doing a task where the user enters three sides of a triangle to calculate the base area and the circumference. I have to uppdate my code because it was not accepted by the teacher. I must do some kind of check to make sure the values make a valid triangle. I search and found some info about Triangle Inequality Theorem and it’s about The sum of the lengths of any two sides of a triangle is greater than the length of the third side

So if I’m getting this right, I have the values A, B and C and I’m going to sum A + B to check if this is greater than C and sum A + C it this is greater than B and finally check if the sum of B + C is greater than A before a calculation is done. Is this correct? Help is preciated!

Answer 1

Your approach summing up the lengths of two sides and comparing them to the third side is correct, but you must do so for every pair of lines.

a + b > c
a + c > b
b + c > a

Only if all three of these are true, you have a triangle.