Tuesday, 16 January 2018

Let ABC be an isosceles ∆ with AB=AC. Let ¶ represent the circumcirle of ∆ABC and O be the centre of circle .Let CO meet ¶ in D.Draw a line parallel to AC through D .
Let it intersect AB at E. Suppose AE:EB=2:1.
PROVE THAT ABC IS EQUILATERAL ∆.
(Hint: you may join BD and DA. And extend DE to BC at F.
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