In the following figure, an isosceles triangle ABC is perfectly enclosed in a semi-circle of radius r. If AB is a diameter of the semi-circle, which of the following expressions shows the combined area of the shaded regions in terms of r?
A. r2(π – 1) / 2
B. r2(π – 2)
C. r2(π – 2) / 2
D. r2(π – 1)
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