Plug ab = 8 into the expression for the volume of the cone and you can solve for a:
Then you can plug into the equation ab = 8 to solve for b:
When the triangle is rotated about its shorter leg, a becomes the height and b becomes the
base radius. Thus,
5 . C
The sides of the pyramid are actually equilateral (the base angles are each 60º, which means
the last angle is also 60º). To find the volume of a pyramid, you need the area of the base,
which is given here as 16, and you need the height, which you have to figure out. Imagine a
triangle that includes the height and one of the lateral edges:
