Trig.

79): Find the area of the sector of the circle. Radius: 2.5 feet. Central Angle: 225 degrees.

I multiplied (1/2)(25/4)(5pi/4), and I got 100pi/16, which reduced to 50pi/8 when I halved it. I reduced that to 25pi/4 or 19.63. But the book's answer is 12.27. How'd I mess up?

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  1. Area of sector of a circle with radius r for sector given in degrees (theta):
    A = (1/2)(r^2)(theta)((pi)/(180)

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  2. Left off the trailing parenthesis...
    Area of sector of a circle with radius r for sector given in degrees (theta):
    A = (1/2)(r^2)(theta)((pi)/(180))

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