To find area of the trapezoid, we need to find height of the trapezoid. When we draw a line from the top base to the bottom base, from the obtuse angle, we will get a triangle with hypotenuse = 10 ft, leg=(14-8) = 6 ft, and second leg (h) is going to be a height of the trapezoid.
We can use Pythagorean theorem, 10² = 6² + h², h²= 64, h=8.
Area of a trapezoid =(1/2)(base1 +base2)*height = (1/2)(8+14)*8= 88 ft².
Answer is 88 ft².