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A B C is an isosceles triangle in which ...

`A B C` is an isosceles triangle in which `A B=A Cdot` If `Da n dE` are the mid-points of `A Ba n dA C` respectively, prove that the points `B ,C ,Da n dE` are concylic.

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`/_ABC=/_ACB`
O and E are a mid point of AB and AC
DE||BC
`/_ADE=/_ABC`
`/_ADE=/_ACB`
`/_ADE+/_EOB=/_ACB+/_EOB`
`/_ACB+/_EOB=180^@`
`/_ACB+/_EDB=180^@`.
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