Posted by Anonymous on Monday, March 16, 2009 at 8:05pm.
which of the following have congruent diagonals?
square
rhombus
parallelogram
rectangle
i believe the answer is the square and rectangle.

math  Angie, Monday, March 16, 2009 at 8:06pm
I think so too.

math  Anonymous, Monday, March 16, 2009 at 8:07pm
what about a parallelogram?

math  Angie, Monday, March 16, 2009 at 8:09pm
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.

math  Anonymous, Monday, March 16, 2009 at 8:12pm
oh yeah, that's right. Thank you very much!
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