A three sided closed plane figure (shape) is a triangle.
A quadrilateral is a closed plane figure with four straight sides.
A polygon
A triangle whose sides are curved outwards.
Cjic
A three sided closed plane figure (shape) is a triangle.
It is a polygon
If they are straight sides, then a polygon. Otherwise, simply "a closed plane figure with 3 or more sides".
a triangle
If none of the sides ever cross each other, there cannot be a closed plane figure.
It is a polygon that is a closed plane figure with 3 or more straight lines.
A quadrilateral is a closed plane figure with four straight sides.
A polygon
A quadrilateral.
1. has at least 3 straight sides 2.closed figure 3. forgot the third one
Polygon
A polygon