All triangles are polygons, having three straight-line sides. However, a right triangle is not a "regular polygon" because the three side lengths and interior angles cannot be the same (the right angle takes up 90 degrees of the total 180). An equilateral triangle is a regular polygon.
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Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
Circles, some triangles, and irregular polygons
Yes triangles are 3 sided polygons
No. Only triangles and cyclic polygons can be circumscribed.
Triangles.