Chapter 5 Prealgebra Question: 1-3 Mr. Keene drew and labeled triangle ABG, shown below, on the board for his students. B. 20 in. 12 In. А 16 in. a) Using the side lengths, explain why triangle ABG is a right triangle. b) Mr. Keene erased and relabeled the side lengths of triangle ABG. The new lengths were each 5 inches less than the original lengths. Explain why triangle ABC can no longer be called a right triangle