Geometry

Question Analysis:
This question involves the perimeter formula of a triangle and the properties of isosceles triangles.
The main focus is on using the given perimeter and the length of the equal sides to find the length of the base.

Key Concept Explanation:
The perimeter of a triangle is the sum of the lengths of its three sides, .
In an isosceles triangle, two sides are equal.
Let the length of each equal side be and the length of the base be , so .

Step - by - Step Solution:
We know that cm and cm.
Substitute into the perimeter formula :

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