An equilateral triangle is a special type of isosceles so an isosceles triangle can not be described as an equilateral triangle so, any equilateral triangle can be an isosceles triangle but an isosceles triangle can not be an equilateral triangle
sometimes, but not always
No, it is never the case.
An isosceles triangle has at least two congruent sides. An equilateral triangle has three congruent sides. So, an equilateral triangle is a special case of isosceles triangles. Since the equilateral triangle has three congruent sides, it satisfies the conditions of isosceles triangle. So, equilateral triangles are always isosceles triangles. Source: www.icoachmath.com
No, none of the equilateral triangle will be isosceles.
Are isosceles triangle sometimes an equilateral triangle
If you can only prove two sides of an apparently equilateral triangle to be congruent then you have to use isosceles.
It can be scalene or isosceles but not equilateral.
The contrapositive would be: If it is not an isosceles triangle then it is not an equilateral triangle.
An Isosceles triangle has at least one line of symmetry but if it has more than one line of symmetry it can be an Equilateral triangle as well as a Isosceles Triangle. So a triangle with one line of symmetry is always Isosceles and If it has more than one it is always an Equilateral triangle as well as an Isosceles triangle. Example of an Isosceles triangle: