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Mathematics 15 Online
OpenStudy (anonymous):

which types of quadrilaterals have congruent diagonals?

OpenStudy (anonymous):

Only rectangles (squares included) have congruent diagonals, because all their angles are congruent (90 degrees). If you have angles larger or smaller than 90 degrees it makes the diagonals different lengths.

OpenStudy (anonymous):

Rectangles as any rectangle including the special sort [squares] have equal diagonals.

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