Theorem of Pappus

The Pappus Theorem states that if you take two separate shapes, such as two circles or rectangles, and rotate each shape around a line outside of them, then the path traced by a point on the shape’s edge (as it moves) can be used to find the volume of the solid formed when these shapes are revolved. Specifically, the volume of this solid depends on the area of each shape and the distance between the lines of rotation. It’s a way to connect shapes’ shapes and positions with the three-dimensional objects created by spinning them.