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26 November, 12:10

Find the measure of the central angle with a radius of 13 inches and the area of a sector measuring 42.25π square inches.

45°

90°

120°

180°

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Answers (1)
  1. 26 November, 14:18
    0
    Area of a sector: 1/2r^2 theta

    Need theta

    Let x be theta for now

    42.25 pi = 1/2r^2x

    84.5pi = r^2x

    84.5pi = 169x

    x = 84.5pi/169 = roughly 1.57 in radians

    Radians = > degrees is 1.57 * 180/pi or roughly 90.
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