Yes.
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If an isosceles triangle is defined as one which has two sides (or angles) equal, then YES. But if an isosceles triangle is defined as one which has two sides (or angles) equal, and the third side (angle) different, then NO.
An isosceles triangle has two congruent sides, and An equilateral triangle is a special isosceles triangle in which all three sides are congruent.Therefore, all equilateral triangles are isosceles
In an equilateral triangle: 3 In an isosceles triangle: 1 In a scalene triangle: 0
The converse is, "If a triangle is isosceles, then it is equilateral." Neither is true.
Any isosceles triangle which is not also an equilateral triangle. An equilateral triangle would have three.