In ΔAPQ, AO = OP = OQ. Prove that ∠POQ = 2 × ∠PAQ
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AO = OP = OQ,
So that the triangle is equilateral triangle.
There also all the angle at the vertices A, P, Q are equal.
PAQ = AQP = QPA = 180/3 = 60
Also, note that as AO = OP = OQ so, this is centroid, incentre, and orthocentre of the triangle.
So the AO, PO, QO bisects the angles
PAQ = AQP = QPA = 60/2 = 30
Now the angle,
POQ = 180 - 30 - 30 = 120
So, it is clearly seen that
∠POQ = 2 × ∠PAQ
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