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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. \[\large Perimeter\;of\;Isosceles\;Triangle,P=2\,a+b\]
See more about definitions at Precision of Definitions. Example of a definition: An isosceles triangle is a triangle with two congruent sides. (if-then form) If a triangle is isosceles, then the triangle has two congruent sides. (reversed if-then form) If a triangle has two congruent sides, then the triangle is isosceles.