For the rectangle shown formed by red boundary,
[tex]\begin{gathered} \text{Length = }7\text{ units } \\ \text{Breadth = 6 units} \end{gathered}[/tex]
The area of the given rectangle is calculated as,
[tex]\begin{gathered} \text{Area = Length }\times\text{ Breadth} \\ \text{Area = 7 units }\times6\text{ units } \\ \text{Area = 42 units}^2 \end{gathered}[/tex]
Thus the area of the given rectangle formed by the red boundary is 42 sq.units.
