This is a very difficult but interesting question from NCERT maths class 10th chapter 13 mensuration, Here it is given a lawnmower takes 750 complete revolutions to cut grass on a field. We have to  Calculate the area of the field??? it is also give that the diameter of the lawnmower is 84 cm and the length of the Lawnmower is 1 m. Honestly i am not able to tell the difference whether i have to find the surface area of the Cylinder(Lawnmower )  of the circumference of the circle to find the area of the field.