Question

From a square cardboard of side 21 cm , a circle of maximum area is cut out . Find the area of the cardboard left .
Answer for class 7 only please

Answer 1

Here is ur answer
Area of square Cardboard=21x21=441 cm^2
Now,max diameter of the circle possible in that sheet is of 21cm!!!
now radius of required circle=21/2cm
now area of circle=πr^2
=22/7*21/2*21/2
=346.5
area of required Cardboard=441-346.5=94.5 cm^2