A quadrilateral is a closed plane figure with four straight sides.
A three sided closed plane figure (shape) is a triangle.
A trapezium (as it is known in English) is a quadrilateral which is a closed plane figure with four straight sides. It has one pair of parallel sides. The other pair of sides is not parallel (otherwise the figure would become a parallelogram).
it's a closed figure with straight sides
hendecagon
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.
If they are straight sides, then a polygon. Otherwise, simply "a closed plane figure with 3 or more sides".
Polygon
A polygon
Yes
yes
Any closed figure that is not entirely composed of straight sides, such as an ellipse or a circle.
A closed plane figure which is bounded by straight sides.
A Polygon is a closed plane figure bounded by straight sides.Polygons is a plane figure with more than 3 straight sides and angles and are typically 5 or more.
a figure, esp. a closed plane figure, having three or more, usually straight, sides.
1. has at least 3 straight sides 2.closed figure 3. forgot the third one