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Sagot :

For this exercise you need to remember that the area of a triangle can be calculated with the following formula:

[tex]A=\frac{bh}{2}[/tex]

Where "b" is the base of the triangle and "h" is the height of the triangle.

Analyzing the information given in the exercise, you can identify that, in this case:

[tex]\begin{gathered} b=x=11units \\ h=7units \end{gathered}[/tex]

Then, knowing these values, you can substitute them into the formula and then evaluate, in order to find the area of the triangle. This is:

[tex]\begin{gathered} A=\frac{(11units)(7units)}{2} \\ \\ A=\frac{77units^2}{2} \\ \\ A=38.5units^2 \end{gathered}[/tex]

The answer is: Option B.