Find the area of a triangle with a base of 5ft and height of 6ft and 3ft?

The triangle only has one height, not two. The height is NOT the length of the other two sides, besides the one it's sitting on. The height is exactly that: the height. It's how high the ceiling has to be if you want to stand that triangle up in a room. In general, the height is LESS than the length of either side that the triangle is not sitting on.