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Posted by on Tuesday, February 22, 2011 at 12:14pm.

"Two points A and B on the circle x^2 + y^2 = 49 form a central angle of 30 degree with the radii draw to them. Find the length of the arc AB in term of pi?"

  • trig - , Tuesday, February 22, 2011 at 12:51pm

    x^2 + y^2 = 49
    r^2 = 49
    r = 7

    Arc length A = angle in rads * r

    To convert 30 deg to radians
    30 deg * pi/180 = 30pi/180 = pi/6

    A = pi/6 * 7
    A = 7pi/6

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