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Given a circle with tangent ST at S and chords PS and QS, if PST = 42^ and PQ = QR, determine QSP.

Mathematics

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Here are the solutions for the angles:

10.2.1 Determine Q^\hat{Q}

  1. Identify known angles and properties.

    We are given that ST is a tangent to the circle at S, and ∠PST=42∘\angle PST = 42^\circ.
    By the Tangent-Chord Theorem, the angle between a tangent and a chord through the point of contact is equal to the angle in the alternate segment.
    So, ∠PST=∠PQS\angle PST = \angle PQS.

    ∠PQS=42∘\angle PQS = 42^\circ
  2. Use the property of equal chords.

    We are given PQ=QRPQ = QR. In a circle, equal chords subtend equal angles at the circumference

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