Based on these sets of side lengths, which triangles are right triangles?
8 units, 15 units, 175 units
8 units, 3 units, v73 units
16 units, 30 units, V50 units
5 units, 7 units, V74 units

M∠abc=138° and m∠def=31° . which statement is true about ∠abc and ∠def ? a: the angles are neither complementary nor supplementary. b: the angles are complementary. c: the angles are supplementary.