## Question

###### The booklet $A l l$ About Lawns published by Ortho Books gives the following instructions for measuring the area of an irregularly shaped region. (See figure in the next column.) Source: All About Lawns. Irregular Shapes (within 5 $\%$ accuracy) Measure a long $(L)$ axis of the area. Every 10 feet along the length line, measure the width at right angles to the length line. Total widths and multiply by 10. $$ \begin{array}{l}{\text { Area }=\left(\overline{A_{1} A_{2}}+\overline{B_{1} B_{2}}+

The booklet $A l l$ About Lawns published by Ortho Books gives the following instructions for measuring the area of an irregularly shaped region. (See figure in the next column.) Source: All About Lawns. Irregular Shapes (within 5 $\%$ accuracy) Measure a long $(L)$ axis of the area. Every 10 feet along the length line, measure the width at right angles to the length line. Total widths and multiply by 10. $$ \begin{array}{l}{\text { Area }=\left(\overline{A_{1} A_{2}}+\overline{B_{1} B_{2}}+\overline{C_{1} C_{2}} \text { etc. }\right) \times 10} \\ {\mathbf{A}=\left(40^{\prime}+60^{\prime}+32^{\prime}\right) \times 10} \\ {\mathbf{A}=132^{\prime} \times 10^{\prime}} \\ {\mathbf{A}=1320 \text { square feet }}\end{array} $$ How does this method relate to the discussion in this section?