It has to have at least 2 congruent angles and/or sides to be isosceles. Therefore, an equilateral angle would be isosceles.
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Isoceles
isoceles triangle
an isoceles triangle has two equal sides and therefore has two angles that are congruent.
An Isoceles triangle has two equal sides and two equal angles (though all triangles have three angles)
The angles of all triangles have a sum of 180 degrees.An isoceles triangle has at least 2 equal sides (if all three are equal, it is an equilateral triangle).