Find the area of this isosceles trapezoid.

A 38.75 in^2
B 77.5 in^2
C 155 in^2
D 198 in^2
Choose one option.

The area of an isosceles trapezoid can be calculated using the formula:

Area = 1/2 * (b1 + b2) * h
Given that the bases of the trapezoid are 10 inches and 20 inches, and the height is 5 inches, we can substitute these values into the formula:
Area = 1/2 * (10 + 20) * 5 = 1/2 * 30 * 5 = 75 in^2
Therefore, the correct answer is B. 77.5 in^2