Posted by Anonymous on .
which of the following have congruent diagonals?
square
rhombus
parallelogram
rectangle
i believe the answer is the square and rectangle.

math 
Angie,
I think so too.

math 
Anonymous,
what about a parallelogram?

math 
Angie,
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,
oh yeah, that's right. Thank you very much!