If Alice divides it into two trapezoids, the area formula would be: A = [(a+b) / 2] * h Trapezoid 1 A = [(7.5 + 15)/2 * 5 A = (22.5/2) * 5 A = 11.25 * 5 A = 56.25 sq. ft
Trapezoid 2 A = [(5 + 10)/2 * 7.5 A = (15/2) * 7.5 A = 7.5 * 7.5 A = 56.25 sq. ft