Final answer:
Option A) A = (1/2)(b1 + b2)h is the correct formula for calculating the area of a trapezoid, by using the average of its two bases (b1 and b2) and the height (h).
Step-by-step explanation:
The area of a trapezoid is found using the formula A = (1/2)(b1 + b2)h. Among the given options, the correct formula for the area of a trapezoid is A) A = (1/2)(b1 + b2)h. The area of a trapezoid is calculated by taking the average of the two bases (b1 and b2), then multiplying by the height (h) and finally dividing by 2. This formula is a reflection of the fact that a trapezoid can be divided into a rectangle and two right triangles, wherein the combined area of these shapes is equal to the area of the trapezoid.