The reason for the toroidal shape is **to allow for a larger cake, which would not cook all the way through without the hole**. The toroidal shape probably became common in the mid nineteenth century. The first known reference to a doughnut is from a 1782 New England diary entry of a Thomas Hazard.

## Why is a donut a torus?

In geometry, a torus (plural tori, colloquially donut or doughnut) is **a surface of revolution generated by revolving a circle in three-dimensional space about an axis that is coplanar with the circle**.

## Is a donut a toroid?

**The torus is an example of a toroid, which is the surface of a doughnut**. Doughnuts are an example of a solid torus created by rotating a disk, and should not be confused with toroids.

## Why are donuts shaped the way they are?

To fully cook the insides of the dough, the dough would have to stay in the oil for a longer time, which would lead to the outsides becoming burnt. **Punching a hole in the middle of the dough, however, allows the insides and the outsides to cook evenly**, creating a perfect doughnut.

## What shape is a donut mathematically?

Torus

**Torus**. A torus is the mathematical name for a doughnut shape or rubber ring shape and is hollow inside.

## Why does a torus have 2 holes?

If the surface does not have a boundary, like a torus, the first cut must begin and end at the same point. **A hollow torus can be cut twice — once around the tube and then along the resulting cylinder** — so by this definition, it has two holes.

## What does toroidal shape mean?

adjective. to·roi·dal tȯ-ˈrȯi-dᵊl. : of, relating to, or shaped like a torus or toroid : **doughnut-shaped**.

## What is the difference between torus and toroid?

A toroid is used as an inductor in electronic circuits, especially at low frequencies where comparatively large inductances are necessary. In geometry, a torus (pl. tori) is a surface of revolution generated by revolving a circle in three-dimensional space about an axis coplanar with the circle.

## What is the difference between toroidal and ellipsoid?

**The image of the source from an ellipsoidal mirror does not show any drastic change whereas the image of the source from a toroidal mirror changes as the source size and divergence are varied**. The image from a toroidal mirror is almost symmetric for a small source size and source divergence.

## Are toroidal planets possible?

Quote from video:

## Why is it called a torus?

A torus, in geometry, is a doughnut-shaped, three-dimensional figure formed when a circle is rotated through 360° about a line in its plane, but not passing through the circle itself. The word torus is **derived from a Latin word meaning bulge**. The plural of torus is tori.

## Where does the term torus come from?

Etymology. Borrowed from **Latin torus** (“a round, swelling, elevation, protuberance”).

## What does torus stand for?

New Latin, from Latin, protuberance, bulge, torus molding.

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