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Algebraic Expressions in Perimeter Formulae

The congruent...

Question

The congruent sides of an isosceles triangle are 4 cm each. If the perimeter is 14 cm, then the 3rd side is:

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Solution

Perimeter = sum of all sides
two sides are given = 4 cm
Let Third side be x
4+4+ x=14
8+x=14
x=14-8
x=6

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