From a rectangular piece of metal sheet.with length and breadth equal

1.	From a rectangular piece of metal sheet.with length and breadth equal to 1.60 mand 80 cm. respectively, 3 circular sheetsof radius 21 cm each are cut out. Findarea of the remaining sheet.
Answer» Area of Reactangular sheet= length * breadth= 16080= 12800 cm^2 Area of circular sheet= pirr= 22/72121= 22321 Area of 3 circular sheet= 921*22= 4158 cm^2 Therefore,Area of remaining sheet= 12800 - 4158= 8642 cm^2

From a rectangular piece of metal sheet.with length and breadth equal to 1.60 mand 80 cm. respectively, 3 circular sheetsof radius 21 cm each are cut out. Findarea of the remaining sheet.

Answer»

Area of Reactangular sheet= length * breadth= 160*80= 12800 cm^2

Area of circular sheet= pi*r*r= 22/7*21*21= 22*3*21

Area of 3 circular sheet= 9*21*22= 4158 cm^2

Therefore,Area of remaining sheet= 12800 - 4158= 8642 cm^2