Test I. 1. A _______ is a quadrilateral with two pairs of 2. _______ sides.

3. A quadrilateral is a parallelogram if both pairs of opposite _______ are parallel and 4. _______ sides.

5. A quadrilateral is a parallelogram if both pairs of _______ angles are congruent.

6. A quadrilateral is a parallelogram if the _______ bisect each other.

7. A quadrilateral is a parallelogram if each diagonal _______ a parallelogram into two congruent 8. _______

9. A quadrilateral is a parallelogram if consecutive _______ are 10. _______

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