Triangle Inequality Theorem Online version This activity will measure your understanding of the triangle inequality theorem. Make sure to use your notes when completing this activity. by Tianny Sims 1 Is a Triangle 2 is NOT a Triangle 7, 5, 9 9, 13, 5 5, 2, 6 14, 7, 9 8, 8, 6 7, 2, 10 10, 6, 4 8, 16, 6 5, 8, 15 8, 8, 17