Question

A cylinder with radius r and height h is closed on the top and bottom. Which of the following expressions represents the total surface area of this cylinder?

(a) $2\mathrm{\pi r}(\mathrm{r}+\mathrm{h})$

(b) $\mathrm{\pi r}(\mathrm{r}+2\mathrm{h})$

(c) $\mathrm{\pi r}+(2\mathrm{r}+\mathrm{h})$

(d) $2{\mathrm{\pi r}}^2+\mathrm{h}$

Answer 1

Let S be the total surface area of the closed cylinder with radius r and height h, then

Hence, the correct option is (a)