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Saturday, 9 August 2014

chapter 2 Quadrilaterals and Parallelograms

Theorem 5
The opposite sides and opposite interior angles of a parallelogram are equal.
Theorem 5a
If a quadrilateral has opposite sides equal then it is a parallelogram.
Theorem 5b
If a quadrilateral has opposite interior angles equal then it is a parallelogram.
Theorem 6
The diagonals of a parallelogram bisect each other.
Theorem 7
The diagonals of a rhombus are perpendicular.

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