A polygon.
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If the lines are straight then it IS a triangle.
A polygon. E.g triangles , sqares ,pentagon .
It is a polygon that is a closed plane figure with 3 or more straight lines.
A polygon is a closed plane (flat) shape where an area is enclosed by a number of straight lines that meet, two at a time. These straight lines form the boundary of the polygon and are called its sides.
No it cannot. A polygon is a plane space enclosed by straight lines. An ellipse consists of a curved line, not straight lines.