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In Fig. 7.21, A C\ =\ A E, A B\ =\ A Dan...

In Fig. 7.21, `A C\ =\ A E`, `A B\ =\ A D`and `/_B A D\ =/_E A C`. Show that `B C\ =\ D E`.

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Given: `AC = AE, AB = AD and ∠BAD = ∠EAC`
To Prove: `BC = DE`
...
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