First watch the demonstration.
Then you can change the lengths of the triangle with the sliders a, b and c. Look whats happening and answer the
following questions:
What happens, when
- the sum of 1 pair of sides exactly equals the measure of a 3rd side?
- the sum of 1 pair of sides is less than the measure of a 3rd side?
- the sum of 1 pair of sides is more than the measure of a 3rd side?