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If the two sides of a pair of opposite sides of a cyclic quadrilateral are equal, prove that its diagonals are equal.

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Given : A cyclic quadrilateral `ABCD` in which `AD =BC`.
To prove: `AC=BD`
Proof : `Because` `AD = BC`, arc `AD` = arc `BC`
Add arc `DC` on both sides.
arc `AD` + arc `DC` = arc `BC` + arc `DC`
`arc ADC = arc BCD`
`AC=BD`
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