Statement Reason 1. line segment AE perpendicular to line segment EC ; line segment BD perpendicular to line segment DC 1. given 2. angle AEC is a rt. angle ; angle BDC is a rt. angle 2. definition of perpendicular 3. angle AEC is congruent to angle BDC 3. all right angles are congruent 4. ? 4. reflexive property 5. triangle AEC approximates triangle BDC 5. AA similarity theorem What is the missing statement in step 4?