Mathematics is an equally important section for RRB Stage II exam and has an even more abundant importance in some other exams conducted by RRB & SSC. Generally, there are questions asked related to basic concepts and formulas of Arithmetic Progression.

To let you make the most of Mathematics section,

**we are providing important facts related to Arithmetic Progression**.**We wish you all the best of luck to come over the fear of Mathematics section.***Also, Railway Exam Stage II is nearby with bunches of posts for the interested candidates in which Mathematics is a major part. We have covered important notes and questions focusing on these prestigious exams.*

**Triangles**

**Centroid [Intersecting Point of medians of the triangle] :**

- Centroid divides median of a triangle in ratio 2 : 1

**→**AG/GE=2/1

→ AG/AE=2/3

→ GE/AE=1/3

- area ∆ ABE = 1/2 area ∆ ABC
- area ∆ AGB = 1/3 area ∆ ABC
- area ∆ AGF = 1/6 area ∆ ABC

- AO = OD
- OG = 1/3 AO
- AB² + BC² = 2BD² + 1/2 AC²
- AB² + AC² = 2AE² + 1/2 BC²
- CA² + CB² = 1/2 AB² + 2 FC²
- Area ∆ FGE = 1/12 area ∆ ABC
- 3 × (sum of side square) = 4x (sum of median square)
- 3 × (AB² + BC² + AC²) = 4x (AE² + BD² + CF²)
- area ∆ ABC = 4/3 area ∆ (Formed by taking AD, BF, CE, as sides of a triangle)

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