A triangle, in which at least two sides are of equal length, is called an isosceles triangle.

The meaning of isosceles is derived from two words “iso” and “sceles”. The meaning of iso is equal and the meaning of sceles is measure. Combine both meanings and apply to a triangle. If it is measured that the lengths of at least two sides are equal in a triangle, then the triangle is called as an isosceles triangle.

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