Question

What is a cross sectional view

Answer 1

In the graph we can see what the back of the truck looks like, what we want to know is the width of the truck inside.

Then we must subtract the edges to the full width. In red we can see the total width and in green we can see the internal width of the back of the truck

`\begin{gathered} x=4(7)/(8)-(1)/(4)-(1)/(4) \\ x=4\cdot(7)/(8)-2((1)/(4)) \\ x=4\cdot(7)/(8)-(1)/(2) \\ x=4\cdot(7)/(8)-(4)/(8) \\ x=4\cdot(7-4)/(8) \\ x=4\cdot(3)/(8) \end{gathered}`