Why don't we call an equilateral triangle an isosceles triangle?

4.5 Geometry - Isosceles and Equilateral Triangles

trigonometry equilateral triangle - Mathematics Stack Exchange

Isosceles and equilateral triangles Worksheets

How can one determine which shape has a larger area: an equilateral triangle or an isosceles right angled triangle? - Quora

properties of triangles and quadrilaterals

Identifying Scalene, Isosceles, and Equilateral Triangles - dummies

Identifying Scalene, Isosceles, and Equilateral Triangles - dummies

Python Exercise: Check a triangle is equilateral, isosceles or scalene - w3resource

Focus The University of Tokyo

13 Examples of Isosceles Triangle in Real Life