Answer:
576.2
Step-by-step explanation:
The formula for the area of a triangle is [tex]\frac{bh}{2}[/tex]. Since this square pyramid is essentially four triangles with base length 21.5 feet and height 13.4 feet, we can calculate the area that they take up with the formula [tex]4\cdot \frac{13.4\cdot 21.5}{2}=576.2[/tex] square feet. Hope this helps!