Polygon : A closed figure made up of three or more line segments that do not cross each other is called a polygon.

Triangle : A triangle is a polygon made up of three line segments.

Quadrilateral : A quadrilateral is a polygon made up of four line segments.

Properties of Triangle :

  1. The sum of angles of a triangle is equal to 180 degree.
  2. The sum of the measure of any two sides is greater than the third side of a triangle.

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