1. (The base on top is 15 ft. To find the base on the bottom you have to first find the length of the right side of the triangle. 7 - 4 = 3. Then, square both sides of the triangle and add them together. 15^2 + 3^2 = 234 Next take 234 and find its square root = 15.3. The bases of the trapezoid are 15 and 15.3) 2. (Both bases and the height.) 3. (2l + 2w does not belong, all of the equations are formulas for area but that one is perimeter)
