You need more information before you can calculate the base.
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You will also need the angles so that you can use the Isosceles Triangle Theorems to solve for the base of isosceles triangle when only two sides are given.
2 interior angles are equal and 2 sides are of equal length.
An isosceles triangle has to have two sides of equal length. An isosceles triangle has to have two sides of equal length.
An isosceles triangle has two equal sides.
An isosceles triangle is a triangle that has at least 2 sides that are congruent.More simply put, an isosceles triangle has two sides of equal length (and therefore two equal angles opposite those equal sides)