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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 ` A B C` is maximum when it is isosceles b) the area of ` A B C` is minimum when it is isosceles c) the perimeter of ` A B C` is minimum when it is isosceles d) none of these

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