Question
Find the distance between the points $P(-1,1)$ and $Q(5,-7)$.
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Answer
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Two tangents TP and TQ are drawn to a circle with centre $O$ from an external point T. Prove that $\angle PTQ =2 \angle OPQ$.
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Very-Short-Answer Question:
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$
→$
2,11,20,29, \ldots
$