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9 (a) Prove that the least perimeter of an isosceles triangle in which a circle of radius r can be inscribed is 6r3. (b)

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9 (a) Prove that the least perimeter of an isosceles triangle in which a circle of radius r can be inscribed is 6r3. (b) Find the area of the region that lies outside the cardioid r=1+cos and inside the circle r=3cos0.

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