Formula: A = [math]\frac{1}{2}h\left(b_1+b_2\right)[/math][br]Height = 3 [br]Base 1 = 3[br]Base 2 = 5 [br][br]Solution: [math]\frac{1}{2}3\left(3+5\right)[/math][br][br]Answer: 12 units[math]^2[/math]