Volumes of Solids of Revolution

By defining a region bounded by a curve (or multiple curves), a line (or lines, including the $x$-axis or $y$-axis), then rotating the region around a line (vertical, horizontal, diagonal, etc.), you can form a 3D object.

Animated Example

Solid rotated around $y$-axis: https://www.desmos.com/calculator/8qdpedyypl
Solid rotated around $x$-axis: https://www.desmos.com/calculator/dg8x58cvnz



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