It is a figure that is the same as another figure in the plane. A square is the same plane figure as another square, but a cube is same the same plane figure even tho it is made up of 6 squares.
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An 8-sided plane figure is an octagon.
A quadrilateral is a closed plane figure with four straight sides.
A three sided closed plane figure (shape) is a triangle.
No, it is a plane figure.
An L shaped figure is a plane figure and so will not have a volume.