From the question, we are asked to find the area of a triangle with the following parameters.
Base = 13 feet.
Height = 6 feet.
recall, the formular for the area of a formular is:
Area of Triangle = 1/2 * b * h
So,
Area of Triangle = 1/2 * 13 * 6
Area of Triangle = 1/2 * 78
Therefore, the Area of the Triangle is = 39 ft