Circles

SAT Math· difficulty 3/5

A circle has radius 9. An arc has central angle frac2pi3\\frac{2\\pi}{3} radians. What is the arc length?

  • A

    6π6\pi

    check_circle
  • B

    3π3\pi

  • C

    9π9\pi

  • D

    2π3\frac{2\pi}{3}

Explanation

Arc length =rtheta=9cdotfrac2pi3=6pi= r\\theta = 9 \\cdot \\frac{2\\pi}{3} = 6\\pi.

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