145.2 ft²
1) Considering that the area of a right triangle can be obtained by the following formula:
We can plug into that the given information:
[tex]\begin{gathered} A=\frac{1}{2}\cdot b\cdot h \\ A=\frac{1}{2}\cdot11\cdot26.4 \\ A=145.2 \end{gathered}[/tex]2) Hence, the area of that triangle is 145.2 ft²