A wooden article was made by scooping out a hemisphere from each end of a cylinder, as shown in the figure. If the height of the cylinder is 20cm and its base is of diameter 7cm, find the total surface area of the article when it is ready.
Height of the cylinder =20cm
Base radius of the cylinder =3.5cm
The total surface area would be the sum of the curved surface area of cylinder and the surface areas of 2 hemispheres which is given by
2πrh+2×2πr2=2πrh+4πr2=2πr(h+2r)=2×227×3.5×(20+2×3.5)=22×27=594 cm2