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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.

blakey
Answer has 2 votes
blakey
20 year member
193 replies

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

link http://wiki.answers.com/Q/What_is_a_two_sided_shape_called

Sep 07 2013, 8:08 PM
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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 http://wiki.answers.com/Q/What_is_a_two_sided_shape_called apparently added an "a" in the middle of the actual term, digon. The digon is described at link http://encyclopedia.thefreedictionary.com/Digon, and it and many other shapes are listed at link https://en.wikipedia.org/wiki/Polygon.

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
TimBentley
Answer has 2 votes
TimBentley
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.

link http://labs.bio.unc.edu/harris/Courses/biol166/curvature.html

Response last updated by CmdrK on Aug 07 2021.
Sep 08 2013, 10:13 PM
houston1127
Answer has 0 votes
houston1127
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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