Solid · Round solids
Cylinder
Two equal parallel circles joined by a curved side.
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Dimensions
Results
volume V
surface area S
curved surface L
Formulas
A prism with a circular base. Unrolled, the side is a rectangle 2πr by h.
Checked: the V, S, L formula agrees with a Monte Carlo measurement of the shape itself, made from its geometric definition, every time the site is built.
Topology lens
Topologically a ball: its surface can be stretched onto a sphere without tearing, so its Euler characteristic is 2. More on the lens.