Determine the lateral surface area of the outer cylindrical surface using the formula Aₒ 2πrₒhFind the lateral surface area of the inner. Surface area calculator online - easyly calculate the surface area of a cube rectangular prism box cylinder sphere cone as well as triangular prism. Complete Solutions Of Exercise 13 1 Class 9th Class Surface Area Of Cy Surface Area Surface Solutions The total surface area is calculated as follows. . 2π r 1 r 2 r 1 r 2 h Defining Terms. What is the surface area of a cylinder with the base radius r 3 cm. Next we look at the four sides which are just triangles. We know the area of a triangle is just bh 2. To find the total surface area well first examine the area of the base which is just a square. Work out the surface area of the cylinder. You can find the surface area of a cylinder using our free online handy calculator and get the output in a fraction of seconds. Surfac...