A rhombus is always equilateral.
It need not be equiangular, but if it is, then most people
look at it and call it a "square".
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A regular polygon must be equiangular as well as equilateral. A rhombus is an example of a polygon that is equilateral but not equiangular.
The rhombus has adjacent angles being the same, and all sides are equal. However, it is not necessarily equiangular.
An equilateral polygon is a polygon whose sides are all of the same measure. An equiangular polygon is a polygon whose angles are all of the same measure. A triangle is the only polygon where these two are effectively one and the same.. But it does not apply to polygons of 4 or more sides. A square and rhombus are equilateral but a rhombus is not equiangular. A square and rectangle are equiangular but a rectangle is not equilateral. This can be extended to all polygons with more than 4 sides but it is more difficult because they do not have distinctive names.
the answer is a square * * * * * No. It is equilateral. An equilateral triangle, or a rhombus are shapes that have equal sides, but neither are a square. The answer is not a regular polygon since that also requires equal angles. A rhombus is equilateral but it is not equiangular and so not regular.
A rhombus has four sides of equal lengths. So it is an equilateral polygon. But it is not an equiangular. It's angles are not equal in measure.