Kyle is trying to prove that δabc is a right triangle. what is the best strategy for kyle to use? a) use the slope formula to prove that ab ⊥ bc; therefore, angle abc is a right angle. b) use the distance formula to find the lengths of ab and bc. perpendicular lines have the same length. c) use the distance formula to find the lengths of ab, bc, and ac. then, substitute the side lengths into the pythagorean theorem. d) use the slope formula to prove that ab ⊥ bc; therefore, angle abc is a right angle. then, use the distance formula to prove that ab ≅ bc.