1. Convex and concave polygon
A polygon is a closed plane figure made up of several line segments that are joined together.
In the picture, there are two polygons: A and B.
Every angle of the polygon A is less than or equal to 180°. It is called a convex polygon.
The polygon B has an angle that is greater than 180°. It is called concave polygon.
2. Types of polygons based on number of sides
We have the following polygons: the triangle (three-sided polygon), the quadrilateral (four-sided polygon), the pentagon (five-sided polygon), the hexagon (six-sided polygon), heptagon (seven-sided polygon), the octagon (eight-sided polygon), the nonagon (nine-sided polygon) and the decagon (ten-sided polygon).
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