A circle of radius r and a right-angled isosceles triangle are drawn such that one of the shorter sides of the triangle is a diameter of the circle. What is the shaded area?
A. √2r B. r² C. 2πr D. πr²/4 E. (√2 - 1)πr²
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B
The shaded area is equal to r² based on geometric properties of the triangle and circle.

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