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°