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A square has four sides, a triangle has three, and a circle has one. What is the name of the shape that has two sides?

Question #132455. Asked by houston1127.
Last updated Aug 07 2021.
Originally posted Sep 07 2013 5:41 PM.

Answer has 2 votes
20 year member
193 replies

Answer has 2 votes.
It is called a diagon. Personally I could not picture it in my head.


Sep 07 2013, 8:08 PM
sportsherald star
Answer has 3 votes
Currently Best Answer
sportsherald star
11 year member
702 replies avatar

Answer has 3 votes.

Currently voted the best answer.
The wikianswers response link apparently added an "a" in the middle of the actual term, digon. The digon is described at link, and it and many other shapes are listed at link

In spherical geometry, a digon looks like a coloured panel of a typical beach ball. [my own observation: If one of these panels were flattened out on a plane, it would be two intersecting curved arcs, which would form two sides, if one accepts the curved side of a circle as a one-sided figure.]

Sep 07 2013, 11:20 PM
Answer has 2 votes
11 year member
83 replies

Answer has 2 votes.
Since a circle was mentioned in the question, we're not restricted to polygons, so a crescent or semicircle also have two sides. You could also have a shape with two different curves in opposite directions, but I don't know what that would be called.


Response last updated by CmdrK on Aug 07 2021.
Sep 08 2013, 10:13 PM
Answer has 0 votes
16 year member
53 replies

Answer has 0 votes.
The question was inspired by wondering what the two-dimensional shape of a Zulu shield is called (angled on the ends with curved sides -- like an American football or an eye or an almond).

Sep 08 2013, 11:45 PM
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