What is the missing reason in the proof? statements reasons 1. st is the perpendicular bisector of rv. 1. given 2. ∠str and ∠stv are right angles. 2. def. of perpendicular bisector 3. rs ≅ vs 3. ? 4. st ≅ st 4. reflexive property 5. δrst ≅ δvst 5. hl theorem perpendicular bisector theorem converse of the perpendicular bisector theorem pythagorean theorem sss congruence theorem