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Prove that In a parallelogram, opposite ...

Prove that In a parallelogram, opposite side are equal

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In `triangleADC` and `triangleABC`
`/_DAC=/_ACB` (`AB` parallel `CD` and taking `AC` as transversal)
`AC=AC` (common)
`/_DCA=/_BAC` (`AB` parallel `CD` taking `AC` as transversal)
By `ASA` criterion of concurrency `triangle ADC` is congruent to `triangle ABC`.
`AD=BC` (By `CPCT`)
`AB=CD` (By `CPCT`)
Hence, proved that in a parallelogram, opposite side are equal.
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