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In geometry, a torus (pl.: tori or toruses) is a surface of revolution generated by revolving a circle in three-dimensional space one full revolution about an axis that is coplanar with the circle. The main types of toruses include ring toruses, horn toruses, and spindle toruses. A ring torus is sometimes colloquially referred to as a donut or ...
The volume (V) and surface area (S) of a toroid are given by the following equations, where r is the radius of the circular section, and R is the radius of the overall shape. = = Pappus's centroid theorem generalizes the formulas here to arbitrary surfaces of revolution.
Solid torus. In mathematics, a solid torus is the topological space formed by sweeping a disk around a circle. [1] It is homeomorphic to the Cartesian product of the disk and the circle, [2] endowed with the product topology.
A view from inside a 3-torus. All of the cubes in the image are the same cube, since light in the manifold wraps around into closed loops. The three-dimensional torus, or 3-torus, is defined as any topological space that is homeomorphic to the Cartesian product of three circles, =.
This illustrates that a coffee mug and a donut are homeomorphic. In mathematics and more specifically in topology , a homeomorphism ( from Greek roots meaning "similar shape", named by Henri Poincaré ), [ 2 ] [ 3 ] also called topological isomorphism , or bicontinuous function , is a bijective and continuous function between topological spaces ...
Simply roll out a sheet of store-bought biscuit dough, cut your donut shapes out, and fry them in the air fryer at 365 degrees Fahrenheit for 6 minutes. Finish by frosting your donuts with your ...
In layman's terms, the genus is the number of "holes" an object has ("holes" interpreted in the sense of doughnut holes; a hollow sphere would be considered as having zero holes in this sense). [3] A torus has 1 such hole, while a sphere has 0. The green surface pictured above has 2 holes of the relevant sort. For instance:
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