Question

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Answer 1

Answer:

Step-by-step explanation:

To prove: DE || BC.Proof:

In order to prove that DE || BC it is sufficient to show that ∠B = ∠ADEIn ΔABC,AB = AC

In the cyclic quadrilateral CBDE, side BD is produced to A.

It is the property of cyclic quadrilateral that its exterior angle is equal to the opposite interior angle.⇒

∠ADE = ∠C .... (2)

From (1) and (2),

we get, which forms corresponding angles.Hence DE || BC.

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