Given: tsr and qrs are right angles; t ≅ q prove: tsr ≅ qrs step 1: we know that tsr ≅ qrs because all right angles are congruent. step 2: we know that t ≅ q because it is given. step 3: we know that sr ≅ rs because of the reflexive property. step 4: tsr ≅ qrs because .