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In this problem, I did part a) correctly, but I got 7 points off in part b) but I don’t know why?

In this problem I did part a correctly but I got 7 points off in part b but I dont know why class=

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Younes69

Answer: You need to prove that ABCD is a rhombus because it's diagonals are always perpendicular, no matter what.

A rhombus is a quadrilateral and:

- its opposite angles have equal measure.

- The two diagonals of a rhombus are perpendicular; that is, a rhombus is an orthodiagonal quadrilateral.

- Its diagonals bisect opposite angles.

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