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Isosceles Triangle Perimeter Formula. An isosceles triangle is said if it has two equal sides and two equal internal angle. While, the perimeter of an isosceles can be found, if the base and sides are known. Formula of Isosceles Triangle Perimeter. \[\large Perimeter\;of\;Isosceles\;Triangle,P=2\,a+b\]
Recall that an isosceles triangle is a triangle with at least two congruent sides. These congruent sides are called legs. The point at which these legs meet is called the vertex point of the isosceles triangle, and the angle formed by the legs is called the vertex angle. The other two angles of the triangle are called base angles. A labeled illustration of an isosceles triangle is shown below. In the past, we determined isosceles triangles by the lengths of their sides. In other words, if we saw that a triangle had two sides with equal lengths, then we classified the triangle as isosceles. There are other characteristics that mark isosceles triangles, however.