The side area of a cylinder is 125.6 square decimeters and its height is 8 decimeters. What is the surface area of the cylinder?

The side area of a cylinder is 125.6 square decimeters and its height is 8 decimeters. What is the surface area of the cylinder?

Yixin: the circumference of the cylinder is 125.6dm & sup2; △ 8dm = 15.7dm, the radius is 15.7dm △ 3.14 △ 2 = 2.5dm, the area of the upper and lower bottom is (2.5dm) & sup2; × 3.14 × 2 = 39.25dm & sup2; the total surface area is 125.6dm & sup2; + 39.25dm & sup2; = 164.85dm & sup2