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Concept

Isosceles Triangle

An isosceles triangle is a triangle that has exactly two sides of the same length. In other words, it has two congruent sides. The congruent sides are called legs while the third side is called the base. The angle between the legs is called the vertex angle and the other two angles are called base angles.
Interactive triangle with a movable vertex
In an isosceles triangle, the base angles are congruent angles — they have the same measure.
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