Question

from a square cardboard is side 21 cm a circle of maximum area of the cardboard left?

Answer 1

Area of the square cardboard will be =21*21=441cm^2.
Therefore, the largest diameter of the circle from the cardboard will be 21cm.
Area of the largest circle=πr^2=22/7*21/2*21/2=346.5cm^2.

Therefore, area left in cardboard=441-346.5=94.5cm^2.

Hope it helps.
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Answer 2

hey.. frnd, here's ur answer >>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

area of cardboard= side×side

=21×21

=441cm^2

the length of the side is 21 cm and if a circle of maximum area is taken then the diameter will be 21cm and radius will be 10.5cm.

area of circle=πr^2

=22/7×10.5×10.5

=2425.5/7

=346.5cm^2

cardboard left=441-346.5

=94.5cm^2

hope this helps u...