Prove that in a parallelogram, opposite angles are equal.
Text Solution
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Since `AB||DC` and `AC` is transversal,
`/_BAC=/_DCA`
Since `AD||BC` and `AC` is transversal,
`/_DAC=/_BCA`
Adding the equations,
`/_DAC+/_BAC=/_DCA+/_BCA`
`/_BAD=/_DCB`
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