The total surface area of a solid cylinder whose radius is r cm and height is $\frac{r}{2}$ cm ( in cm2) is :

$3π\frac{r^2}{2}$ $4πr^2$ $3πr^2$ $π\frac{r^3}{2}$

$3πr^2$

Total surface area of cylinder = 2πr ( r + h ) = 2 × π × r ( r + \(\frac{r}{2}\)  ) = 2 × π × r × \(\frac{3r}{2}\) = 3πr²