how many diagonals are there in a 2-sides polygon?

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter5: Similar Triangles
Section5.CR: Review Exercises
Problem 34CR: Find the length of a diagonal of a square whose side is 4 in. long.
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how many diagonals are there in a 2-sides polygon?

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If two lines meet, you get an angle, either acute or obtuse or a right angle. They, too, do not enclose any area. so they cannot be called or form polygons.

So there is no diagonal, since there is no polygon.

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