Exact enclosed area R will be;
Area sector with radius 2 unit and angle (90-2tan–¹(½)) - Area sector with radius 1 unit and angle (180-4tan–¹(½)) + Area isosceles triangle with two equal lengths 1 unit and angle (180-4tan–¹(½)).
=((90-2tan–¹(½))x4π÷360) - ((180-4tan–¹(½))xπ÷360) + 0.5sin(180-4tan–¹(½))
= 1.1235011088 square unit.
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