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.[Hint. Diameter of circle of maximum area = 21 cm.]
Answer» Side of cardboard = 21 cm :. radius of circle for its area to be max would be 21/2cm Area of square= 2121 = 441cm^2. Area of circle = (22/7)(21/2)*(21/2)= 346.185 cm^2 :. the difference = 94.815 hit like if you find it useful Wrong answer94. 5 cm²

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

Answer»

Side of cardboard = 21 cm

:. radius of circle for its area to be max would be 21/2cm

Area of square= 21*21 = 441cm^2.

Area of circle = (22/7)*(21/2)*(21/2)= 346.185 cm^2

:. the difference = 94.815

hit like if you find it useful

Wrong answer94. 5 cm²