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In order to calculate the area of this triangle, we can use the following formula:
[tex]A=\frac{b\cdot h}{2}[/tex]Where b is the base and h is the height relative to this base.
So, using b = 31.5 and h = 22, we have:
[tex]\begin{gathered} A=\frac{31.5\cdot22}{2} \\ A=346.5 \end{gathered}[/tex]So the area of the triangle is 346.5 in².