Question

The radius of the base of a cylinder is 28 cm, and the height of the cylinder is 48 cm. Find the surface area of the cylinder in terms of .

Answer 1

See, the area of the circular base is pi * r^2 . And there are two circular bases one on either end, so total circular area is

2 (pi * r^2)

And the area of the curved surface is 2 * pi * r * h

Now add both the area you must get ;

2 * pi * r ( r +h)

You can directly use the last formula.. but it will be more clearer to you if you do it in detail. Good luck