Question

The sum of the lengths of any two sides of a triangle must be greater than or equal to the length of the third side.

True
False

Answer 1

It's true. To understand why, imagine what it would look like if you had a triangle with the sum of the lengths of two sides less than the third side. The third side would be too long, so there would be a gap. They actually must be greater than the third side, if they're equal to it then it will just be a line, not a triangle.