What is the Formula for the Perimeter of an Isosceles Triangle? The perimeter is measured in linear units like centimeters, meters, inches, and so on. Since an isosceles triangle has 2 equal sides and one different side, the formula that is used to find the perimeter is, Perimeter of isosceles triangle = 2a + b where 'a' is one of the equal sides and 'b' is the unequal side. The perimeter of an isosceles triangle is the total length of its boundary. How to find the Perimeter of an Isosceles Triangle? Since an isosceles triangle has two equal sides, the perimeter is twice the equal side plus the different side. The perimeter of an isosceles triangle is the sum of all the three sides.
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