First, I will solve for one triangle. To find the area of a triangle, you multiply width by height and half the product. So in other words 9 times 2, and that answer divided by 2. 9X2=18 and 18/2=9. Now multiply this triangle by 6, since the problem asks for 6 triangular pennants. 6X9=54 so 54.0ft² is your final answer.