The answer is, "C. 181.5 in²."
The formula to calculate the area of a trapezoid is [tex] \frac{a+b}{2} [/tex]h.
The bottom and top bases must be divided by 2.
[tex] \frac{11.5+21.5}{2} [/tex]
Divide that sum by 2, then multiply the height.
[tex] \frac{33}{2} [/tex]
16.5·11=181.5
The area of the trapezoid is 181.5 in².
