What is a counterexample for, "If the diagonals of a parallogram are congruent then it's a square."

Question

anonymous · Answer

the diagnols of a rectangle are congruent.
A rectangle is a parallogram but not a square.

anonymous · Answer

I think this is right. Don't count on it being true 100% you might want to check it.

anonymous · Answer

What about a rhombus? Do you know if thats congruent? :o

anonymous · Answer

on never thought about that. But I'm not that familiar with rhombus but I would assume that the diagnols are the same.

anonymous · Answer

thankss!

anonymous · Answer

Here's a rhombus with the diagonals drawn:

|dw:1336006330399:dw|

Are the diagonals equal?

anonymous · Answer

Oh you got me. Lol good job @SmoothMath

anonymous · Answer

Haha "You got me"
good response.

anonymous · Answer

So it's a rhombus?

anonymous · Answer

If I make a statement like, "If a toy is a ball, then that toy is rubber."
How would you prove me wrong?

anonymous · Answer

the toy is a ball hahah

anonymous · Answer

Restated:
"All balls are rubber"