Quadrilateral EFGH is inscribed in a circle. For positive real numbers, a, b, c, and d, let EF = √a, FG = √b, GH = √c, and HE = √d. If a + d = b + c, find the area of the circle.
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Perhaps you at least can get started by studying this: Cyclic Quadrilateral -- from Wolfram MathWorld
So because there are no actual number values I should only get my area in terms of a, b, c, and d?
If FH is a diameter then circle area is (a+d) * pi/4
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