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If non-parallel sides of a trapezium are...

If non-parallel sides of a trapezium are equal, prove that it is cycli.

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In `/_\DAM` and `/_\CBN`
`AD=BC` (Given)
`/_AMD=/_BNC` (Right angles)
`DM=CN` (Distance between the parallel lines)
Therefore, `/_\DAM` and `/_\CBN` are congruent by RHS congruence condition.
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