• Triangle: – A triangle is a three-sided polygon. In fact, it is polygon with the least number of sides. Triangle ABC is written as . There are three sides of a triangle. Thus, sides of are \overline {AB,} \overline {BC} and \overline {CA} . There are three angles in a triangle. Thus, angles of  are \angle BAC,\angle ABC and \angle BCA. The points A, B and C are called the vertices of the . Like angle, a triangle also has three regions associated with it.
  • On the triangle
  • The interior angle of the triangle
  • The exterior angle of the triangle
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