Answer:
Three equal length sides.
Step-by-step explanation:
A Triangle is considered an Equilateral Triangle if and only if all three sides are of the same length. If just one side is of a different length then the Triangle stops being an Equilateral Triangle and becomes an Isosceles Triangle. For Example, the following image is an Equilateral Triangle since all 3 sides have an equal length of 20m.
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