Question

A steel beam that is $12meters$ long is cut into four equal parts. The cross sections are rectangles with side lengths of $1meter$ and $2meters$.

(b) What is the area of each cross section?

Answer 1

Hint: Identify the shape of the cross section then use the formula to find the area.

Note that the cross sections is a rectangle. Given the side lengths as $1meter$ & $2meters$.

The formula of Area of rectangle is given as: $A=(l\times w)$

Where $l$ is the length & $w$ is the width of the rectangle.

Here, $l=2\&w=2$

Substitute the values in the formula, We get

$$\begin{gathered} A=(l\times w) \\ A=1\left(2\right) \\ A=2 \end{gathered}$$

Final Answer: Hence, The area of the cross sections is $2squaremeters$.