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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 trapezoid is a quadrilateral with one pair of parallel sides and congruent base angles, or it is a trapezoid with congruent base angles. An isosceles triangle is a triangle with two equal sides. A kite is a quadrilateral that has two pairs of adjacent sides congruent (the same length).