Answer:
The area of the rectangle is;
![91\text{ square units}](https://img.qammunity.org/2023/formulas/mathematics/college/d239ybk9jevfnwmpyzrnnla0v4th171gqm.png)
Step-by-step explanation:
Given the rectangle LKMN with the coordinates;
![L(1,1),K(8,1),M(8,14)\text{ and N(1,14)}](https://img.qammunity.org/2023/formulas/mathematics/college/rh8ivymm8r0n3ag6whacly09a1ioyynju9.png)
Recall that the area of a rectangle is the product of length and width;
![A=l* w](https://img.qammunity.org/2023/formulas/mathematics/college/lmmzpu3pbc5f31ild3jzkycy7t9l4cj8y8.png)
From the given coordinates, the length and width of the rectangle are;
![\begin{gathered} w=\sqrt[]{(8-1)^2+(1-1)^2} \\ w=7 \\ l=\sqrt[]{(8-8)^2+(14-1)^2} \\ l=13 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/akfm9vfq6gzl1ekz3ncubfqbjcvqod84d2.png)
Substituting the values of the length and width, we have;
![\begin{gathered} A=13*7 \\ A=91\text{ square units} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/w6o8e209k65x8pz4zt8etuxpbim06ggn39.png)
Therefore, the area of the rectangle is;
![91\text{ square units}](https://img.qammunity.org/2023/formulas/mathematics/college/d239ybk9jevfnwmpyzrnnla0v4th171gqm.png)