Most people think Earth is a perfect sphere… But it's actually an oblate spheroid—bulging at the equator and flattened at the poles. The equator is 13 miles farther from Earth’s center than the poles. If you wanted a perfect sphere with the same volume as Earth? It would be 7,920 miles in diameter. And here’s where it gets wild—this number ties directly into sacred geometry and ancient models of creation. The blueprint of the universe might be more mathematical than we think. | The Randall Carls

Find the volume of solid generated by revolution of one arc of the cycloid x=a(θ-sinθ);y=a(1-cosθ)