The perimeter of any geometric figure corresponds to the sum of the length of all its sides and for this there are mathematical formulas that help us to find it. In the case of triangles, It should be noted that the calculation will vary depending on the type of triangle and in this OneHowTo article we explain in detail how to calculate the perimeter of a triangle, whether it is equilateral, isosceles or scalene.
Calculate the perimeter of an equilateral triangle
The equilateral triangles They are those whose three sides have the same length and, therefore, their angles also measure the same. Thus, to obtain the perimeter of an equilateral triangle, you must multiply the value of the length of its side by three:
P = 3 xl
Let’s take an example to see it more clearly: calculate the perimeter of an equilateral triangle with a side 6 cm.
P = 3 x 6 = 18 cm
Calculate the perimeter of an isosceles triangle
On the other hand, isoscele triangless are those in which two of its sides are equal and one different, which will be the base. So, in this case, to find the perimeter of the triangle, you must apply the formula that says that you must multiply the value of the side by two and add the length of the base:
P = 2 xl + b
Example: Find the perimeter of an isosceles triangle whose equal sides are 8 cm and the base is 3 cm.
P = 2 x 8 + 3 = 16 + 3 = 19 cm
Calculate the perimeter of a scalene triangle
Finally, the last type of triangle is scalene, in which each of the sides has a different size. So, in this case, you should limit yourself to adding the value of the three lengths to obtain the perimeter:
P = a + b + c
Suppose that the values of the sides of a scalene triangle they are 5 cm, 8 cm and 10 cm, calculate their perimeter.
P = 5 + 8 + 10 = 23 cm
Other formulas
If you want to know other formulas related to triangles and geometry, don’t stop reading:
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