An equilateral triangle is a special case of an isosceles triangle. #206
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An isosceles triangle is a triangle with (at least) two equal sides. A triangle with all sides equal is called an equilateral triangle, and a triangle with no sides equal is called a scalene triangle. An equilateral triangle is therefore a special case of an isosceles triangle having not just two, but all three sides and angles equal.
http://mathworld.wolfram.com/IsoscelesTriangle.html