Question

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°: Triangle ABC with segment DE. Angle ADE measures 47 degrees. The flowchart with missing statements and reasons proves that the measure of angle ECB is 43°: Statement, Measure of angle ADE is 47 degrees , Reason, Given, and Statement, Measure of angle DAE is 90 degrees, Reason, Definition of right angle, leading to Statement 1 and Reason 2, which further leads to Statement, Measure of angle ECB is 43 degrees, Reason, Substitution Property. Statement, S