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If a quadrilateral circumscribes a circl...

If a quadrilateral circumscribes a circle whose sides are `a,b,c` in that order then `a+c=b+d. ABCD` is an isosceles trapezium in which `AB||CD and AB=16 cm, CD=4 cm,` then Area of the circle is (A) `16 pi` (B) `32pi` (C) 48pi (D) `64pi`

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