shape. Once the child conceptualizes the shape of a trapezium, relevant related
concepts are to be explained. A paper which is cut in the form of a trapezium may also
be provided to the child to explore its structure.
- Parallelogram
In a quadrilateral if the opposite sides are parallel to each other, then it is called a
parallelogram.
The idea may be explained orally supported by the provision of a concrete parallelogram
constructed with a paper or plastic.
- Rhombus
In a parallelogram if all the four sides are equal then it is called a rhombus. Note that
in a rhombus all the sides are equal in length and the diagonals are perpendicular to
each other. Let the child measure the diagonals and understand they are only
perpendicular to each other and not equal in length whereas the diagnals in a square
are of equal length.
Provision of a rhombus made either of paper or plastic may enable the child to
understand the idea better.
