Law Of The Donut Math Answer Key -

This comes from Pappus’s theorem: Volume = (cross-sectional area of tube) × (distance traveled by its centroid) Cross-sectional area of tube = ( \pi r^2 ) Distance traveled by centroid = ( 2\pi R ) So:

[ S = 4\pi^2 R r ]

It sounds like you’re referring to the — a common playful name for a math problem involving torus volume or surface area , often found in calculus or geometry classes. Law Of The Donut Math Answer Key