Question

Prove that the tangents drawn at the end points of a chord of a circle make equal angles with the chord.

Answer 1

Let PQ be the chord of a circle with center O
Let AP and AQ be the tangents at points P and Q respectively.
Let us assume that both the tangents meet at point A.

Join points O, P. Let OA meets PQ at R
Here we have to prove that ∠APR = ∠AQR
Consider, ΔAPR and ΔAQR
AP = AQ [Tangents drawn from an internal point to a circle are equal]
∠PAR = ∠QAR
AR = AR [Common side]
∴ ΔAPR ≅ ΔAQR [SAS congruence criterion]
Hence ∠APR = ∠AQR [CPCT]