(1) Definition of triangle; (2) How to write an angle; (3) Types of angles; (4) What is an Acute Angle?; (5) What is an Obtuse Angle?; (6) What is a Right Angle?; (7) Types of Triangles; (8) What is an Equilateral Triangle?; (9) What is an Isosceles Triangle?; (10) What is a Right Angled Triangle?; (11) What is the Pythagoras theorem?; (12) Difference between congruency and the similarity; (13) How to represent an angle; (14) When a triangle will be right angle triangle; (15) How to understand a right angle
