Hi there!
The formula for an area A of a trapezoid with height h and bases of b1 and b2
A = h(b1+b2)/2
h= 12
b1 = 10
b2 = 15
A = 12(10+15)/2
= 6 * 25
= 150
The area is 150 ft².
Have an awesome day! :)
From your friendly Helper-in-Training, collinjun0827