It's called an 'equilateral triangle'.
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All triangles have three sides. An isosceles triangle has two sides which are the same length and an equilateral triangle has all three sides of the same length.
It is an isosceles triangle when two of its three sides are of the same length.
Equilateral Triangle (Assuming all three sides of the triangle are the same, regardless of the length.)
If all three sides are equal in length, the triangle is said to be Equilateral.
An equilateral triangle has three sides of equal length. The sum of the three internal angles (60o each) equals 180o