Solution;
The total surface area is the sum of the areas of all the faces.
The area of the 2 triangles combined is;
[tex]\begin{gathered} 2(\frac{1}{2}bh) \\ =bh=8\times9.2=73.6cm^2 \end{gathered}[/tex]
The area of the 3 rectangles are;
[tex]2(20(10))+8(20)=560cm^2[/tex]
Therefore, the Lateral surface area is;
[tex]560cm^2[/tex]
and the Total surface area is;
[tex]633.6cm^2[/tex]
