Circles

SAT Math· difficulty 3/5

An inscribed angle in a circle subtends an arc of measure 80°80°. What is the measure of the inscribed angle?

  • A

    80°80°

  • B

    20°20°

  • C

    40°40°

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  • D

    160°160°

Explanation

By the Inscribed Angle Theorem, an inscribed angle is half the measure of its intercepted arc: frac80°2=40°\\frac{80°}{2} = 40°.

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