The formula for area of a triangle is 1/2(b x h).
First, we'll have to identify our base and height. Since the problem gives them to us, we can rewrite the formula as 1/2(6 x 9).
From there, we can solve by multiplying.
1/2(6 x 9)
1/2(54)
And finally, we can divide to find the area.
1/2(54)
27
Therefore the area of the triangle is 27 feet.
Hope this helps! :)