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Three Sided Polygon - Triangle

Properties Types / Classification Perimeter of Equilateral Triangle Median of Triangle Interior of a Triangle Exterior of a Triangle Altitude of a Triangle Interior Angles of Triangle Exterior Angles of Triangle Interior Opposite Angles of Triangle Adjacent Interior Angle of Triangle Congruent Triangles Area of Triangle Area of Triangle by Heron's Formula Construction of Triangle (compass)

Before you study about what is a triangle, you are advised to read

What is a Polygon ?

"Tri" means Three, so a polygon which have 3 angles is known as Triangle. A Triangle have 3 Sides, 3 Angles and 3 Vertices.
In order words: Triangle is a simple closed curved made up of three line segments.

In the Above diagram :-
Triangle ABC has
3 Sides
- AB, BC and CA
3 Angles - ABC, BCA and CAB
3 Vertices - A, B and C

In the Above diagram :-
Triangle PQR has
3 Sides
- PQ, QR and RP
3 Angles - PQR, QRP and RPQ
3 Vertices - P, Q and R