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Diagonals of Quadrilaterals

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1- prove that the diagonals of a rhombus bisect each other at right angels.
2- prove that diagonals of a kite or dart (possibly extended) intersect at right angels.

(Note: kite is a convex quadrilateral in which 2 pairs of adjacent sides are congruent dart is a non convex quadrilateral in which 2 pairs of adjacent sides are congruent)

Please see the attached file.

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These are two proofs regarding diagonals of quadrilaterals.

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