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 10  Decagon

 A quadrilateral is a polygon with four edges (or sides) and four vertices or corners.
 Some special quadrilaterals are :-
 Parallelogram – A quadrilateral with two pairs of opposite sides parallel is called a
parallelogram.

 Rhombus – A parallelogram with all sides equal is called a rhombus.

 Trapezium – A quadrilateral with only pair of opposite sides parallel is called a trapezium.

A triangle is a polygon with three edges and three vertices. It is one of the
basic shapes in geometry.
 Equilateral triangle is a regular polygon.
 Isosceles triangle is an irregular polygon.
 Scalene triangle is an irregular polygon.