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`A B` is a diameter of a circle and `C` is any point on the circle. Show that the area of ` A B C` is maximum, when it is isosceles.

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 maximum when it is isosceles

D

none of these

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