JJAP+3

Level 3: Deduction




Statement / Justification

1. AB II DC, AD II BC / 1. Given

2. ∠CBE = ∠ADE, ∠ABE = ∠CDE / 2. Alternate interior angles are congruent

3. ABD=CDB / 3. ASA

4. AD=BC, AB=DC / 4. CPCTC

5. ABCD = parallelogram / 5. Definition of a parallelogram