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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. \[\large Perimeter\;of\;Isosceles\;Triangle,P=2\,a+b\]
An isosceles triangle has two sides of equal length. An isosceles triangle also has two angles of the same measure; namely, the angles opposite to the two sides of the same length; this fact is the content of the isosceles triangle theorem, which was known by Euclid.