theorems on quadrilaterals

Theorem 8.8: A quadrilateral is a parallelogram if a pair of opposite sides is equal and parallel. Theorem 8.7 Theorem 8.9

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Theorem 8.7: If the diagonals of a quadrilateral bisect each other, then it is a parallelogram. Theorem 8.6 Theorem 8.8

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Theorem 8.6: The diagonals of a parallelogram bisect each other. Theorem 8.5 Theorem 8.7

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Theorem 8.5: If in a quadrilateral, each pair of opposite angles is equal, then it is a parallelogram. Theorem 8.4 Theorem 8.6

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Theorem 8.4: In a parallelogram, opposite angles are equal. Theorem 8.3 Theorem 8.5

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Theorem 8.3: If each pair of opposite sides of a quadrilateral is equal, then it is a parallelogram. Theorem 8.2 Theorem 8.4

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Theorem 8.2: In a parallelogram, opposite sides are equal. Theorem 8.1 Theorem 8.3

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Theorem 8.1: A diagonal of a parallelogram divides it into two congruent triangles. Home Theorem 8.2

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