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What is the third side of isosceles triangle called?

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Quick Answer

The third side of an isosceles triangle is called the base. The triangle has a total of three sides, and the base connects the remaining two sides, which are referred to as the legs. The two legs of the isosceles triangle must be equal in length.

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Full Answer

Used in geometry, the isosceles triangle can be classified as acute, right or obtuse, depending on the vertex angle. An acute isosceles triangle has a vertex angle of less than 90 degrees. A right isosceles triangle has a vertex angle of exactly 90 degrees. An obtuse isosceles triangle has a vertex angle of more than 90 degrees.

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