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Prove that the angles formed by the tangents from the endpoints of a chord are equal.

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Each angle between a chord and the tangent at one of its ends is equal to the angle in the segment on the other side of the chord. 

[Angles in the alternate segments are equal].

∴ ∠P = x ie ∠RBA = x.

ie ∠QAB = ∠RBA

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