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AB is a diameter of a circle and C is an...

AB is a diameter of a circle and C is any point on the circumference of the circle. Then (a) the area of `DeltaABC` is maximum when it is isosceles (b) the area of `DeltaABC` is minimum when it is isosceles (c) the perimeter of `DeltaABC` is minimum when it is isosceles (d) none of these

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