11. From a square cardboard of side 21 cm, a circle of maximum area is

1.	11. From a square cardboard of side 21 cm, a circle of maximum area is cut out. Findthe area of the cardboard left.
Answer» Diameter of circle =Side of square Diameter of circle = 21 cmRadius of circle = 21 /2 cm Area of circle = pi r^2 = 22 21 * 21 /7 * 2* 2= 22 * 21 * 3 / 4= 462 * 3 /4= 1386/4= 346.5 cm^2 Area of cardboard left = Area of square - Area of circle Area of cardboard left = 21*21 - 346.5= 441 - 346.5= 94.5 cm^2 hit like if you find it useful

11. From a square cardboard of side 21 cm, a circle of maximum area is cut out. Findthe area of the cardboard left.

Answer»

Diameter of circle =Side of square Diameter of circle = 21 cmRadius of circle = 21 /2 cm

Area of circle = pi *r^2 = 22 * 21 * 21 /7 * 2* 2= 22 * 21 * 3 / 4= 462 * 3 /4= 1386/4= 346.5 cm^2

Area of cardboard left = Area of square - Area of circle Area of cardboard left = 21*21 - 346.5= 441 - 346.5= 94.5 cm^2

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