Circles

SAT Math· difficulty 3/5

A circle has radius 10. What is the arc length of an arc with central angle 144°144°?

  • A

    8π8\pi

    check_circle
  • B

    4π4\pi

  • C

    10π10\pi

  • D

    144π144\pi

Explanation

Arc length =frac144360cdot2pi(10)=frac25(20pi)=8pi= \\frac{144}{360} \\cdot 2\\pi(10) = \\frac{2}{5}(20\\pi) = 8\\pi.

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