Or

Author:
Steve Johnson

1) determine if 3 lengths are sufficient to form a triangle

2) Given 2 lengths, determine the range of lengths for the 3rd side

Take a piece of spaghetti and break it into 3 pieces and set 1 of them aside (keep the other 2 handy, we will call them sides 1 and 2). Now take another piece of full length spaghetti (we'll call it side 3) along with sides 1 and 2 AND make a triangle.

Did you notice a problem?

Tutorial

Now lets talk about why you could not make a triangle

Source: Steve Johnson