Which of the following is NOT a property of a parallelogram?

Question

anonymous · Answer

1)	
Opposite angles are congruent.

	2)	
Opposite sides are parallel

	3)	
Diagonals are Congruent

	4)	
Opposite sides are congruent

jack1 · Answer

pop the rest of your q buddy

jack1 · Answer

diagonals angles are the same in a parallelogram
opposite sides are congruent
its a parallelogram... so pretty confident that each of the opposite sides would be parallel
what does that leave us with?

jack1 · Answer

given the choices, i'd go 1

anonymous · Answer

Thanks for your help.

anonymous · Answer

It's not 1

anonymous · Answer

Can you tell me how you got it

jack1 · Answer

opposite sides can be swapped,
opposite sides are parallel
diagonal angles can be swapped
... u sure?

anonymous · Answer

If you're speaking to me, then yes, I'm sure.  :-)

jack1 · Answer

well.. where am i lying...?

anonymous · Answer

|dw:1370616300042:dw|

jack1 · Answer

|dw:1370616268471:dw|
1)	
Opposite angles are congruent....?
these can't be swapped, they're not the same so they're not congruent

anonymous · Answer

Yes, opposite angles ARE congruent.

|dw:1370616474175:dw|

jack1 · Answer

those are diagonal angles

jack1 · Answer

diagonals are congruent

anonymous · Answer

Stop it. I'm pointing to the corners, not the lines.

The diagonals are NOT congruent.

anonymous · Answer

Diagonals are NOT congruent in a parallelogram.

jack1 · Answer

ok.
why?

anonymous · Answer

Congruency essentially means "identical in every way". Are the diagonals identical lengths?

anonymous · Answer

Look at the two lines, compare the sizes. 
Opposite angles means the exact other side, as in |dw:1370616785630:dw|

jack1 · Answer

ok, different definitions, to me those are diagonally opposite angles
to me; opposite angles across a vertical split is the 2 i circled initally

jack1 · Answer

but fair enough, ur right, my bad

anonymous · Answer

So the answer to the original problem is...  ?

:-)

anonymous · Answer

3) Diagonals are congruent

anonymous · Answer

so it is 3

anonymous · Answer

YES!! We have a winner!!!  :-)

anonymous · Answer

BTW, Diagonals ARE congruent on a square - which is also a parallelogram.  :-)

But it is not a "property" of parallelograms because all parallelograms are not squares.

The other 3 properties listed are ALWAYS true for ALL parallelograms.

anonymous · Answer

you guys are really smart