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A 3-sided polygon is called a "triangle". If the 3 sides are congruent (that implies that the 3 angles are also congruent), it's called an "equilateral triangle".
A 3-sided polygon has 0 parallel sides. A 4-sided polygon can have 0, 2 or 4 parallel sides. A 5-sided polygon can have 0, 2, 3 or 4 parallel sides. In general, an n-sided polygon can have 0, 2, 3, ..., n-1, or n parallel sides where n>5. A polygon with n sides can have n pairs of parallel sides (if n is even) or (n-1)/2 pairs if n is odd AND greater than 3. But it need not have any.
there isn't a polygon with 3 sides but there are triangles. polygons start with hexgons; 5 sided shapes.
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The minimum number of sides for a polygon is 3 sides.
Providing that it is a regular polygon it will have 8 sides.