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In the figure, AB=AD , BC=CD . Prove ...

In the figure, AB=AD , BC=CD . Prove that `angle A B C=angle A D C`

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Ans: Jóin BD. Since `A B=A D` `angle A B D=angle A D B` Since `B C=C D, angle C B D=angle C D B^*` `angle ABD+angle CBD=angle ADB+angle CDB` `rarr angle A B C=angle A D C`
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