if two sides are of equal length, the a triangle is said to be isoceles.
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A ISOSCELES triangle.
With all sides equal it is an EQUILATERAL triangle
With one right angle it is a RIGHT ANGLED traigle/
With no sides equal it is a SCALENE triangle.
A triangle with at least two sides of equal length is called an isosceles triangle.
An isosceles triangle is a triangle that has at least 2 sides that are congruent.More simply put, an isosceles triangle has two sides of equal length (and therefore two equal angles opposite those equal sides)
Using the traditional definitions, a triangle that has two equal sides (and angles) is an isosceles triangle and one with three equal sides (and angles) is an equilateral triangle. However, some mathematicians define an isosceles triangle as any triangle having at least two equal sides, which is what you are describing.
An isosceles triangle is any triangle with at least two sides of equal length. Logically, an isosceles triangle also has at least two angles of equal size. An equilateral triangle is a triangle with three equal sides and three equal angles (all of which are 60 degrees). Since it has at least two equal sides then it is therefore also an isosceles triangle. This is no different to the way in which a square is also a rectangle, or a circle is also an ellipse. They are simply special cases of the general case.
Equilateral triangle has all three sides of equal length and all three angles are equal. Isosceles only has two sides of equal length and two of the angles are equal.the equilateral triangle has 3 equal sides and a isosceles triangle has 2 equal sides. that should help