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In an isosceles triangle A B C with A B=...

In an isosceles triangle `A B C` with `A B=A C ,` a circle passing through `B` and `C` intersects the sides `A Ba n dA C` at`Da n dE` respectively. Prove that `D E C Bdot`

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To prove`=/_ADE=/_ABC`
Proof
`/_ABC` is an isosceles
`/_ACB=/_ABC-(1)`
BCDE is a cyclic quadrilateral
`/_ADE=/_ACB-(2)`
From equation 1 and 2
`/_ABC=/_ADE`.
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