The **SSC** has notified **SSC CGL**** new vacancy 2020** through its website. The candidates need to practice hard to score well in the exam.

__Quantitative Abilities Topic 1 for ____SSC CGL 2020____ Aspirant : __

***Regular Polygons **

- Regular polygons are the geometrical structures where all the sides and angles of the structure are equal.
- It includes triangle (Regular polygon with 3 sides), quadrilateral (Regular Polygon with 4 sides), Pentagons (Regular Polygon with 5 sides), etc.
- These are also called as
**an n-sided polygon**, where n is the number of sides in a polygon. For example, a triangle is a 3- sided polygon with n=3. - There may be to types of
**regular polygons** and these two are star and **convex**.

**Basic properties of Regular Polygons to learn before attempting ****SSC CGL EXAM****:**

**Symmetry**: These types of regular polygons have a symmetrical reflection.- The sum of each interior and exterior angle at a single vertex is always 1800.
- The exterior angle of regular polygon must be 3600/n, where n is the side of a regular polygon.
- Number of diagonals in a regular polygon can be calculated from the formula
**12*n* (n-3)** where n is the side of a regular polygon.

**For example,**

In a square where **n=4**,

The number of diagonals are** = 12* 4* (4-3)**

** = 12*4*1**

** =2**

__Quantitative Abilities Topic 1 for ____SSC CGL 2020____ Aspirant : __

***Right Prism**

- Right Prism is the solid geometrical structure bounded by polygon at its base and
**parallelograms** at the other two sides and sides are** perpendicular (900) **to the ends.

- It is a 3- dimensional structure.
- On the basis of different polygons the name of right prism changes.

**For example**, when the base polygon is a triangle, it is called the right triangle

prism or when the base polygon is rectangular it is called **right rectangular prism **

and so on.

**Formulas related to Right Prism are as follows:**

**Volume of a Right Prism **= **Area of Base Polygon *** **Height of the right prism ****Surface area of a** **Right Prism** = (**2 * Area of base Polygon**) + **surface area of parallelograms**

__Quantitative Abilities Topic 1 for____ SSC CGL 2020 ____Aspirant : __

***Right Circular Cone**

- The right circular cone is a geometrical structure of a cone that has a circular section and its
**axis** is **perpendicular (900) **to the base of the cone. - It is a cone with a
**circular base**.

- The right circular cone also has slant height as a measurement denoted by l which joins the vertex of the cone to the exterior point of the circular base of a right
**circular cone**. - All measured elements in a right circular cone are equal.
- A triangle formed from the vertex to the base of the right circular cone always forms an isosceles triangle.

Formulas related to Right Circular Cone are as follows:

**Slant height l=h2+r2**

- Lateral Surface Area of Right Circular Cone

** Lateral Surface Area = πrl**

- Total Surface Area of a Right Circular Cone

** ****Total Surface Area = π (r+ l) r**

- Volume of Right Circular Cone:

** Volume = 13πr2h**

All the best to All the aspirants of **SSC-CGL2020 !**