Length of rectangular sheet of paper = 40 cm
Breadth of rectangular sheet of paper = 28 cm
Radius of the semicircular cut out = 14 cm
Area of rectangular sheet of paper = Area of rectangle = length × breadth = 40 × 28 = 1120 cm2
Area of semicircular cut out = 1/2 πr2
= 1/2 x 22/7 x 14 x 14
= 308 cm2
Now,
Area of remaining sheet of paper = Area of rectangular sheet of paper – Area of semicircular cut out
= 1120 – 308
= 812
Therefore, area of remaining sheet of paper is 812 cm2.