1. Identification of Plane Shapes
  2. Properties of Circles and Triangles
  3. Properties of Quadrilaterals: Square, Rectangle, Trapezium, Rhombus, Parallelogram, and Kite
  4. Identification and Naming of Polygons
  5. 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.


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

Geometric construction - parts of a circle

The outer boundary of the circle is called the circumference.

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