An equilateral triangle is a type of triangle where all three sides are of equal length. This property also means that all three internal angles are the same, each measuring 60 degrees. Equilateral triangles are a special case of isosceles triangles, which have at least two equal sides. These triangles are often found in various fields, including geometry and architecture. Their symmetrical shape makes them aesthetically pleasing and structurally stable, which is why they are commonly used in design and construction. Additionally, equilateral triangles can be used to create tessellations and other geometric patterns.