Perimeter of Isosceles Triangles

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What is an isosceles triangle?
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A triangle with at least two sides of equal length.
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How do you calculate the perimeter of an isosceles triangle?
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Perimeter = 2(a) + b, where 'a' is the length of the two equal sides, and 'b' is the base.
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If the equal sides of an isosceles triangle are 5 cm each and the base is 8 cm, what is its perimeter?
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The perimeter is 18 cm.
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How would the perimeter formula change if only the base length is given?
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Without additional information or context, you can't fully determine the perimeter with only the base in an isosceles triangle.
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What roles do the congruent angles of an isosceles triangle play in perimeter calculations?
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Congruent angles do not directly affect the perimeter calculation, which is based solely on the lengths of the sides.
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