Pappus's Theorem


 * Pappus's Hexagon Theorem
 * Pappus Centroid Theorems, of which there are $2$ instances:
 * Pappus's Centroid Theorem for Surface Area, also known as the First Pappus-Guldinus Theorem (with )
 * Pappus's Centroid Theorem for Volume, also known as the Second Pappus-Guldinus Theorem (with )