Perimeter of equilateral triangle: So

So, the perimeter of an equilateral triangle is 3a, where "a" is the side length of the triangle . In the figure given above, ∆ABC is an equilateral triangle with equal sides that measures "a" unit. Formula to find the perimeter of an equilateral triangle is P = 3a, where P is the perimeter and a is the side length. In the above triangle the length of the side is 8 cm, therefore the perimeter is 3 × a = 3 × 8 = 24 3 × a = 3 × 8 = 24 cm. Perimeter of an Isosceles, Equilateral and Scalene Triangle Below table helps us to understand how to find the perimeter of different triangles - Equilateral triangle , Isosceles triangle and Scalene triangle . Where a, b, c and l are the side lengths and P = Perimeter . Perimeter of an equilateral triangle can be computed using its area, which is given by, A r e a = 3 4 a 2 Area = 4 3a2. Now, We know, Perimeter of an equilateral triangle = Side + Side + Side. Perimeter of an equilateral triangle , P is given by = 3 × a. Therefore, the values a can be replaced by P/3. A r e a = 3 4 (P 3) 2 Area = 4 3(3P)2.