Names of different triangles.

This may seem very simple but it is necessary for you to know the types of triangles to avoid embarrassment.

An undergraduate in,"Who Wants To Be A Millionaire " could not tell the name of a triangle with all its sides unequal some years ago. Therefore, the importance of knowing the names of triangles.  Viz:

1. Equilateral Triangle: This is a triangle with all equal sides and all equal angles,

2. Scalene Triangle: This is a triangle with all unequal sides and unequal angles,

3.Isosceles Triangle: This is a triangle with equal opposite sides and equal base angles,

4.Right Angle Triangle: This is a triangle which has 90° as one of its angles.

Names of Polygons from 1-20

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• Meaning of polygon:

A polygon is any plane shape bounded by straight lines. 

Polygons are named according to their number of sides.

Namely:

3 Triangle: Is a three sided polygon,

4 Quadrilateral: Is a four sided polygon,

5 Pentagon:  Is a five sided polygon,

6 Hexagon: Is a six sided polygon,

7 Heptagon: Is a seven sided polygon,

8 Octagon: Is an eight sided polygon,

9 Nonagon is a nine sided polygon,

10. Decagon: Is a ten sided polygon,

11 Endecagon:Is an eleven sided polygon,

12 Dodecagons:Are twelve sided polygons,

13 Tridecagon: Is a thirteen sided polygon,

14 Tetradecagon: Is a fourteen sided polygon,

15 Pentadecagon: Is a fifteen sided polygon,

16 Hexadecagon: Is a sixteen sided polygon,

17 Heptadecagon : Is a seventeen sided polygon,

18 Octadecagon: Is an eighteen sided polygon,

19 Enneadecagon: Is a nineteen sided polygon, 

20 Icosagon : Is a twenty sided polygon.

How to find the total sum of angles in any polygon.

Whenever you are asked to calculate the total sum of angles in any polygon of any number sides, please use this formula:

(n-2)×two right angles. One Right Angle is 90°, therefore, two Right Angles is 180°.

In simple form, the formula for finding the total sum of angles of an n-sided polygon is:

(n-2)×180. Where  n=number of sides of any  given polygon.

For instance: Find the total sum of angles of a Pentagon.

Solution:

Remember, a Pentagon is a 5-sided polygon.

Therefore: (n-2)×180=(5-2)×180°

3×180°=540°

Ans=540°

You can calculate the total sum of angles of any polygon using that formula,(n-2)×180°

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