Checking if 3 side values form a triangle

Question

With 3 side values given, how do i check if it forms a triangle or not?

Answer 1

shouldn't all of the triangle sides equal up to 180 degrees?

Answer 2

Zach 3 is correct ;p

Answer 3

if there are 3 sides it has to be a triangle  

Answer 4

I would think that if the sum of the two shorter sides were less than the longest side, a triangle could not be formed. What do you think?