Any triangle is an instance of the smallest possible polygon. Poly means many, gon means sides. You can't have a 2-sided figure, at least not in this Universe.
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An isosceles triangle is a 3 sided polygon.
A regular polygon is a shape in which all angles are equal. An isosceles triangle has two equal sides, thus two equal angles, but the other side/angle differs. Therefore an isosceles triangle is not a regular polygon.
An isosceles triangle or a rhombus.
If it is a triangle, it is considered isosceles.
An isosceles triangle has three sides, two of which are exactly equal in length.