The SSC has notified SSC CGL new vacancy 2020 through its website.
The candidates need to practice hard to score well in the exam.
- 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 are as follows:
- 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)
- 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
- 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 of Right Circular Cone
Slant height l=h2+r2
2. Lateral Surface Area of Right Circular Cone
Lateral Surface Area = πrl
3. Total Surface Area of a Right Circular Cone
Total Surface Area = π (r+ l) r
4. Volume of Right Circular Cone:
Volume = 13πr2h
All the best to all the aspirants of SSC-CGL2020!