Equilateral is just what it sounds like... equal. If you're talking about an equilateral triangle, then all 3 sides will be the same length.
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None. Triangles - whether equilateral or not - do not have diagonals
three sides
It means that the figure is equilateral. Equilateral does not mean regular. For example, a rhombus has equal sides but it is not a regular quadrilateral.
an equilateral triangle is a triangle in which all three sides are equal.Equilateral means that all the sides in a figure are congruent. Regular polygons are all equilateral.
Regular shapes are both equilateral and equiangular. Irregular shapes may or may not be equilateral and equiangular.