On the other hand, it is possible to classify triangles according to the types of internal angles they have. In this case, the formula indicates that the perimeter is equal to 12 x 2 + 19 (that is, to 43). To calculate the perimeter of an isosceles triangle, you can multiply the length of the repeating side by two and then add the length of the third side. Two of its sides are identical ( 12 centimeters in length), while the third has another measurement ( 19 centimeters). If a triangle has two sides that measure 12 centimeters and a side that measures 19 centimeters, can be classified as an isosceles triangle.

As a curious fact, which can sometimes go unnoticed, it is possible to say that every equilateral triangle is isosceles, although the same does not happen in the opposite direction. This means that these triangles not only have two equal sides, but also two equal angles. Returning to isosceles triangles, it should be noted that angles Opposite sides that are the same length are also equal. In the equilateral triangles, the three sides are equal, while in the scalene triangles, all sides are different. The peculiarity of isosceles triangles, therefore, is that two of their sides have a length identical. Those triangles that have two sides what do they measure equal, are isosceles.

The notion of isosceles triangle is linked to the classification that is made according to what their sides.

Triangles can be classified in different ways. In the case of triangles, they are polygons with three segments (sides), unlike quadrilaterals (four sides), pentagons (five sides) and other figures. Let us remember that polygons are flat figures formed by joining segments.

Isosceles triangle meaning