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1.>Each diagonal divides it into two congruent triangles.

2.>Diagonals need not bisect angles at the vertices.

I dont understand these two properties.

*In property 1:*

what does congruent triangles means ? i am not familiar with this term...is this same as "similar triangle" ?

please explain.

*In property 2:*

it says, diagonal does not bisect vertices. If this is so , that means two halves of the triangle does not have the same area when a diagonal divides the parallelogram......am i correct ?

Or, in other words ,...In mathematical term, if ABCD is the parallelogram and if BD is the diagonal....then Area ABD =! Area BDC ......is this correct ?