definition of triangle in math
Definition of Triangle. A three-sided polygon is called to be a triangle. A Triangle is a polygon with three sides. More About Triangles. Equilateral Triangle: A triangle with all the sides of same length is called equilateral triangle. Isosceles Triangle: A three-sided polygon with at least two sides of the same length is called isosceles triangle. Scalene Triangle: A three-sided polygon with no sides of the same length is called scalene triangle.