# What does isosceles mean in geometry?

The word "isosceles" is, mostly, used referring to *triangles* with two sides equal in length

Here are major properties of isosceles triangles.

Draw altitude

It divides our triangle into two *right triangles* that share a *cathetus* *hypotenuses*

These triangles are congruent by *cathetus* and *hypotenuse* and, therefore altitude

Consequently, two angles at the base of this *isosceles triangle* are also congruent.

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In geometry, "isosceles" refers to a type of triangle where two sides have equal lengths. This means that the two sides of the triangle are of the same length, while the third side may be of a different length. An isosceles triangle typically has two equal internal angles opposite the equal sides. The term "isosceles" is derived from Greek, where "isos" means "equal," and "skelos" means "leg" or "side." Therefore, an isosceles triangle is essentially a triangle with two equal sides.

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