An 8-sided plane figure is an octagon.
A quadrilateral is a closed plane figure with four straight sides.
A expample of a plane figure with 6 sides and 6 vertices is called a hexagon. hex means 6.
It is a dodecagon
A polygon
An 8-sided plane figure is an octagon.
An octagon.
A pyramid with a base that has seven sides.
An octagon.
A plane figure with eight sides is an octagon.
A quadrilateral is a closed plane figure with four straight sides.
Because an "octagon" is defined as a closed plane figure with 8 vertices which is bounded by straight lines. It must, therefore, have eight sides.
If they are straight sides, then a polygon. Otherwise, simply "a closed plane figure with 3 or more sides".
its self because a plane figure is a figure that is flat and has all strait sides.
circle
No plane figure has four vertices unless it has four sides.
hendecagon