Recall all interior angles in a triangle add up to 180°, therefore
Answer:
128 ft²
Step-by-step explanation:
The formula for the area of a trapezoid applies:
A = (1/2)(b1 +b2)h . . . . . where b1, b2 are the base lengths and h is the height
For Alex's dimensions, the area is ...
A = (1/2)(14 ft +18 ft)(8 ft) = 128 ft²