# PLANE SHAPES

CONTENT

- Identification of Plane Shapes
- Properties of Circles and Triangles
- Properties of Quadrilaterals: Square, Rectangle, Trapezium, Rhombus, Parallelogram, and Kite
- Identification and Naming of Polygons
- Similarities and Differences between Regular Quadrilaterals

## Identification of Plane Shapes

A flat surface, such as top of a table, a playing field, ceiling, wall, face of a tin and star board face is referred to as a plane. It is a plane because it is two dimensional, i.e. it is measured in only two directions.

Figures drawn on flat or plane surfaces are called plane shapes. Examples include rectangle, square, triangle, parallelogram and trapezium.

All these shapes are referred to as a regular shape, i.e. they have definite length and breadth.

There are also irregular shapes (they do not have definite length and breadth), e.g. leaves, stones, etc.

### Circle

The shape traced out in which every point of it is same distance from a fixed centre point is called circle.

The outer boundary of the circle is called the **circumference.**

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