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​Q8. A circle of largest area is cut from a rectangular piece of card-board with dimensions 55 cm and 42 cm. Find the ratio between the area of the circle cut and the area of the remaining card-board.

Radii of circle = 21cm. Area of circle = 1386cm^2. Area of remaining cardboard= (area of cardboard - area of circle) I.e. 924cm^2. Ratio => 231 : 154
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