A triangle is a 3 sided polygon.
A polygon has 3 or more joined side
A 3 sided polygon is the shape of a triangle.
A polygon can have 3 or more sides
Any polygon has 3 or more sides
the trigon have 3 side
convex TeTe <3
It is the only polygon whose side lengths determine its shape.
the side of a polygon is 6
A 3 sided polygon with 2 equal sides is an isosceles triangle
The 11 side polygon is called bysocleptron