Triangle, octagon, and my favorite, dodecagon.
Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
Regular polygons.
they are all polygons
They both have three(3) or more sides. =)
Three or more.
irregular polygons are just polygons that do not have equal angles and side so a scaling and isosceles triangles are 2 and trapezoid is another.
Polygons are shapes with three sides or more. Circular shapes are NOT polygons.
polygons
Polygons are shapes that have three or more sides * * * * * There is more to a polygon. It is a closed, plane (flat) shape. The three or more sides must be straight lines.
Any convex three dimensional figure with straight edges (or plain faces) will have polygons for bases so there is an infinity of such shapes.
Cone
All three are polygons.