SAT Math Multiple Choice Question 158: Answer and Explanation

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Question: 158


In the circle with center O and radius 10 shown above, ∠AOB = . What is the length of minor arc AB ?

  • A. π
  • B. 2π
  • C. 4π
  • D. 20π

Correct Answer: C


C Use the formula arc = , where r is the radius and θ is the measure of the central angle in radians. Because the angle is already in radians, you just need to plug in 10 for the radius and the angle into the formula. You then get s = (10) or 4π, which is (C).

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