Question

Given a parallelogram ABCD. Complete each statement along with the definition or property used.

1. AD = ______
2. ∠DCB = ______
3. OC = ______
4. m∠DAB + m∠CDA = ______

Answer 1

1. In a parallelogram, opposite sides are equal in length.
   AD = BC
2. In a parallelogram, opposite angles are equal in measure.
   ∠DCB = ∠DAB
3. In a parallelogram, diagonals bisect each other.
   Hence, OC = OA
4. In a parallelogram, adjacent angles are supplementary to each other.
   Hence, m∠DAB + m∠CDA =180°