Define Equilateral Triangle

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Equilateral triangle is defined as the type of a triangle in which all angles and all sides are equal. Since we know that the sum of all angles of triangle is 180 degrees. So every angle = 180/3 = 60 degree each. Figure is shown below indicates an equilateral triangle.

In this figure all sides and angles are equal hence this triangle is known as equilateral triangle. Perimeter of triangle is the sum of all sides of triangle and Area is the product of ½ x base x height.
This can better understand by the following examples:-
 
Example 1: Find the perimeter of equilateral triangle if one side of triangle is 30 cm. 

Solution : Given one side is 30 cm.

  Since it is equilateral triangle, so in this case all sides are equal to 30 cms.

 Therefore, Perimeter of triangle = sum of all sides of triangle = 30 + 30 + 30 = 90

 Hence the perimeter of equilateral triangle with side 30 cm is 90 cm.
 
Example 2: Find the perimeter of equilateral triangle if one side of triangle is 100 cm.

Solution : Given one side is 100 cm.

 Since it is equilateral triangle, so in this case all sides are equal to 100 cms.

 Therefore, Perimeter of triangle = sum of all sides of triangle = 100 + 100 + 100 = 300

 Hence the perimeter of equilateral triangle with side 100 cm is 300 cm.


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