20
Prove that the tangents drawn at the ends of a diameter of a circle are parallel.
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Let $PQ$ and $RS$ be tangents at the end of diameter $AB$.
$\angle PAO = \angle RBO = 90^{\circ}$
$\implies PQ \parallel RS$
Let $PQ$ and $RS$ be tangents at the end of diameter $AB$.
$\angle PAO = \angle RBO = 90^{\circ}$
$\implies PQ \parallel RS$