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.

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

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

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**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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