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Show that the diagonals of a parallelog...

Show that the diagonals of a parallelogram divide it into four triangles of equal area.

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P is mid point of AC and BD
AP=PC
PB=DP
`/_APB and /_DPC`
AP=PC
PB=PD
AB=DC
area of `/_APB`=area of `/_DPC`
...
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