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<powerprep> arcs and chords

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<powerprep> arcs and chords [#permalink] New post 04 Sep 2006, 12:11
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Question from powerprep. See attachment for details.
Basically it is asking for the length of minor arc PQ.
Please ignore marked answer. What is the underlying concept here?
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 [#permalink] New post 04 Sep 2006, 12:27
A 2pi

using properties of triangles and parallel lines.
if C is the center of the circle, then CPQ = PQC = 70;
the angle subtending the arc is 40; so the length of the arc is 40/360 * 2 * pi * 9
  [#permalink] 04 Sep 2006, 12:27
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<powerprep> arcs and chords

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