"tri-" means "three".
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A triangle - any triangle - has 3 sides.
A triangle has 3 sides.
If all 3 sides are equal: Equilateral Triangle If 2 sides are equal: Isosceles Triangle If all 3 sides are unequal/different: Scalene Triangle
It is an equilateral triangle that has 3 congruent sides
An equilateral triangle has 3 equal sides