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 68°. the following flowchart with missing statements and reasons proves that the measure of angle ecb is 22°: which statement and reason can be used to fill in the numbered blank spaces? corresponding angles are congruent triangle sum theorem measure of angle aed is 22° corresponding angles are congruent base angle theorem measure of angle aed is 68° alternate interior angles are congruent triangle sum theorem measure of angle aed is 22° alternate interior angles are congruent triangle angle sum theorem measure of angle aed is 68°