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### 13 Cards in this Set

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 Theorem 7.1 If a quadrilateral is a parallelogram, then its opposite sides are congruent. Theorem 7.12 A parallelogram is a rectangle if and only if its diagonals are congruent. Theorem 7.3 If a quadrilateral is a parallelogram, then its consecutive angles are supplementary Theorem 7.10 A parallelogram is a rhombus if and only if its diagonals are perpendicular. Theorem 7.5 Converse of 7.1 Theorem 7.8 Converse of 7.4 Theorem 7.7 Converse of 7.3 Theorem 7.6 Converse of 7.2 Theorem 7.9 If one pair of opposite sides of a quadrilateral are congruent and parallel, then the quadrilateral is a parallelogram. Theorem 7.4 If a quadrilateral is a parallelogram, then its diagonals bisect each other. Theorem 7.11 A quadrilateral is a rhombus if and only if each diagonal bisects a pair of opposite angles. Theorem 7.2 If a quadrilateral is a parallelogram, then its opposite angles are congruent. Theorem 7.13 A parallelogram is a square if and only if its diagonals are both perpendicular and congruent.