because there is no other polygon that has three sides excpt a triangle!!!!!!!!!!!!!!!!!!!
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A three-sided, two-dimensional polygon is called a "triangle".
A three sided polygon is called a triangle or a triagon It comes in three types -the Equilateral triangle - all sides of equal lengththe Isosceles triangle - two sides of equal lengththe Scalene triangle - all sides of different length
A polygon can have any number of sides above three. The name of a three-sided polygon is a triangle.
isoceles triangle
an equilateral triangle