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Home Geometric Elements Non-Euclidean Polygon Basics Symmetry Similar/congruent Triangles Quadrilaterals Feedback Websites


A triangle is the simplest polygon, having three sides and three angles. The sum of the three angles of a triangle is equal to 180 degrees.


Types Of Triangles
Their ProperTies...


Triangles are classified by sides and by angles...


Classified by:

Number of equal sides:

  Isosceles: Two equal sides, side a=side b

Scalene: No equal sides

Equilateral triangle: Three equal sides, side a=b=c


Types of Angles              


Acute: Three acute angles

Obtuse: One obtuse angle

Right angled triangle: 1 right angle