Perimeter and Area of Plane Figures

A plane figure is made of line segments or arcs of curves in a plane. It is a closed figure if the figure begins and ends at the same point. We are familiar with plane figures like squares, rectangles, triangles and circles.

Definition of Perimeter:

The perimeter (P) of a closed plane figure is the sum of the lengths of its bounding sides (line segments or arcs). Perimeter is measured in units of length such as centimetre (cm) and metre (m).


Definition of Area:

The area (A) of a closed plane figure is the region of the plane enclosed by the figure’s boundary. Area is measured in square units of length such as square centimetre (cm\(^{2}\)) and square metre (m\(^{2}\)).













9th Grade Math

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