IF (and only if) the lines are al coplanar, then a polygon.
Poo,bum,wees
polygon
A polygon.
triangel
A three sided closed plane figure (shape) is a triangle.
Poo,bum,wees
polygon
polygon
polygon
polygon
A irregular is a closed plane figure formed by three or more line segments.
A polygon.
triangel
polygon
A polygon.
a triangle
A triangle is a geometric figure that is made of three line segments. It is a closed figure and has three angles.