Triangles are very important to understand as knowledge of Triangles is tested in most of the major academic and competitive exams. 

Triangle is one of the polygons as it is a closed shape made up of line segments. Triangles are three-sided shapes. 

There are two types of triangles - Scaler, Isosceles, right Triangle. 

• Isosceles Triangles (45-45-90 Triangle) - These triangles have two sides equal. 
• Equilateral Triangles (30-60-90 Triangle) - These triangles have all sides equal. 

Properties of a triangle - 

1. The sum of all three angles of a triangle is equal to 180 degrees. 

2. Sum of any two sides is always more than the length of third side. 

3. 

Pythagorean Theorem / Pythagorous Theorem for Triangles- 

a² + b² = c²