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

Lesson Explainer: Isosceles Triangle Theorems

Isosceles and Equilateral Triangles

The University of Tokyo on LinkedIn: Why don't we call an equilateral triangle an isosceles triangle?

Area of an Equilateral Triangle ( No Height Given)

A garden in the shape of an isosceles triangle - Math Central

Triangles

Polymathematics: Morley's Theorem

HIROSE Yuki The University of Tokyo

Proving Congruent Isosceles Triangles - Lesson

Isosceles and equilateral triangles Worksheets

The University of Tokyo on LinkedIn: Why don't we call an equilateral triangle an isosceles triangle?

The University of Tokyo on LinkedIn: Why don't we call an equilateral triangle an isosceles triangle?

Are all isosceles triangles similar to each other? What about scalene or equilateral triangles? - Quora