Triangle abc is a right triangle. point d is the midpoint of side ab and point e is the midpoint of side ac. the measure of angle ade is 47°.. . the flow chart with missing statements and reasons proves that the measure of angle ecb is 43°.. . which statement and reason can be used to fill in the numbered blank spaces? . 1. corresponding angles are congruent . 2. triangle sum theorem. 3. measure of angle aed is 43°.. 1. alternate interior angles are congruent . 2. base angle theorem. 3. measure of angle aed is 47°