Now we look at 4 sided polygons, which are called quadrilaterals, a quadrilateral can be named as a Square, rectangle, rhombus, trapezium, kite or a Parallelogram based on the different properties of the quadrilaterals. If all the sides of the quadrilateral are equal, then it is a regular quadrilateral. It can be a square or a Rhombus, depending upon the angles measure of the figure, which we will study in other sessions. In a quadrilateral we have a closed figure formed by joining 4 sides of equal or unequal lengths. All the quadrilaterals have 4 sides, 4 vertices and so it has 4 angles. If the quadrilaterals are in form of the square or Rectangle, then it has all angles equal (90 degrees each).
Now we see that the 5 sides polygon is called a pentagon, the 6 sides polygon is called a Hexagon, the 7 sides polygon is called a heptagons, the 8 sides polygon is called a octagon, the 9 sides polygon is called a nonagon, the 10 sides polygon is called a decagon.