Question

If the lateral surface area of a cylinder is 94.2cm2, and its raius is 3cm then find: i the height ii its volume (use pie as=3.14)

Answer 1

i) Height = 5 cm
ii) volume = 141.3

i) Area = 2.π.r.h
  94.2 = 2 x 3.14 x 3 x h
  94.2 = 18.84 x h
 h = 94.2/18.84
 h = 5 cm


ii) Volume = πr^2 h
                    = 3.14 x (3)^2 x 5
                  = 3.14 x 9 x 5
                   =141.3