Theorem 1: Diagonal of a Parallelogram Divides It into Two Congruent Triangles
A photo frame...
Question
A photo frame is in the shape of a quadrilateral. With one diagonal longer than the other. Is it a rectangle ? why or why not ?
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Solution
The rectangle has two diagonals equal in length. But according to question, the diagonals are uneven. Hence we can say that the photoframe is not a rectangle. It is either parallelogram or rhombus.