The theorem is illustrated below.

Proof: Construct the trianglesandby drawing radii as below.

since both are radii of the circle andis common to both. Further, anglesince these are between a tangent and a radius. From Pythagoras theorem,so

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The theorem is illustrated below.

Proof: Construct the trianglesandby drawing radii as below.

since both are radii of the circle andis common to both. Further, anglesince these are between a tangent and a radius. From Pythagoras theorem,so