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An isosceles triangle is a triangle with at least two equal sides. While there are no other names, an equilateral triangle has 3 equal sides so it is also an isosceles triangle
Two sides of an isosceles triangle are equal. The base is the other side.
They are not the same. If they were, you would not need two different names for them!
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 has two equal angles. -- An isosceles triangle has two equal interior-angle bisectors. -- The bisector of the vertex angle of an isosceles triangle is also the perpendicular bisector of the triangle's base.