Two hemispherical ends = 4*pi*radius2
Lateral surface area of the cylinder = 2*pi*r*lenght of cylinder
Work both out separately and the sum of them will give you the total surface area in square units.
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A cylinder with radius 4 and height 12 has a total surface area of 402.12 units2
If the radius of the hemispheres is 4, then that leave 4 units for the length if the straight part of the cylinder. Total surface area = surface area of 1/2 sphere of radius 4 + lateral surface area of cylinder of radius 4 and height 4 + surface area of 1/2 sphere of radius 4. = surface area of sphere of radius 4 + lateral surface area of cylinder of radius 4 = 4*3*pi*43 + pi*42*4 = 469.1 cubic units.
Surface area of a cylinder = (pi) x (diameter of the circular end) x (length)
The surface area of a cylinder with the radius of 2 and height of 3 is 62.83 units2
The surface area is 552.92 units2