Question

nd the surface area of a cylinderose radius is 1.2 mm and whoseheight is 2 mm.Round to the nearest tenth.SA = [?] mm²

Answer 1

Step 1

Given;

$\begin{gathered} A\text{ cylinder with radius 1.2mm} \\ Height=2mm \end{gathered}$

Required; To find the area

Step 2

The area of a cylinder is given as;

$\begin{gathered} A=2\pi rh+2\pi r^2 \\ A=(2\times\pi\times1.2\times2)+(2\times\pi\times1.2^2) \\ A=4.8\pi+2\times\:1.2^2\pi \\ A=24.12743mm^2 \\ A\approx24.1mm^2 \end{gathered}$

Answer;