We want to find the volume of the pyramid. Recall that the volume V of a pyramid is one third the area of the base B times the height of the pyramid h.
V=1/3 B h
Let's use the diagram to identify the pyramid's height and write an expression for the area of its base. Remember that the area of a triangle is half the product of any base and its height.
Now we can substitute 12* 7* 18 for B and 11 for h into the formula and calculate the volume of the pyramid.
