A doughnut (donut).
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A sphere is round - like a tennis ball. A torus is ring-shaped - like a donut !
A ring-shaped body is commonly known as a torus. A = 4 pi2 R r R is the distance from the center of the tube to the center of the torus, r is the radius of the tube.
Topology is the study of objects (often surfaces in 3D) where details like position, shape and curvature are unimportant. Two topological objects are considered equivalent if they can be stretched to look like one another. An example of two different topological objects are a sphere and a doughnut shape (torus); the sphere cannot be stretched to look like the torus because it doesn't have a hole and the torus does.
Half a torus. A torus is a doughnot (donut) shape.
it is shaped like a whale