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Circles

SAT Math· difficulty 3/5

An inscribed angle in a circle subtends a diameter. What is the measure of the inscribed angle?

  • A

    90°90°

    check_circle
  • B

    45°45°

  • C

    180°180°

  • D

    60°60°

Explanation

A diameter subtends a semicircle (180°). The inscribed angle is half: frac180°2=90°\\frac{180°}{2} = 90° (Thales' theorem).

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