You can put this solution on YOUR website! The chord area = (R^2/2) * ( ((theta * pi)/180) - sin theta), where R is the radius
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Note the above says the chord area = area of circular sector - area of triangular portion
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we are given the chord area = 20 cm^2 and theta = 90
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20 = (R^2/2) * ( ((90 * pi)/180) - sin 90)
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(R^2/2) * ( (pi/2) - 1) = 20
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(R^2/2) * 0.5708 = 20
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(R^2/2) = 35.0385
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R^2 = 70.077
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Area of circle = pi * R^2 = pi * 70.077 = 220.1534 approximately 220 cm^2
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