<P> In geometry , three or more than three straight lines ( or segment of a line ) make a polygon and an equilateral polygon is a polygon which has all sides of the same length . Except in the triangle case , it need not be equiangular ( need not have all angles equal ) , but if it does then it is a regular polygon . If the number of sides is at least five , an equilateral polygon need not be a convex polygon : it could be concave or even self - intersecting . </P>
<P> In geometry , three or more than three straight lines ( or segment of a line ) make a polygon and an equilateral polygon is a polygon which has all sides of the same length . Except in the triangle case , it need not be equiangular ( need not have all angles equal ) , but if it does then it is a regular polygon . If the number of sides is at least five , an equilateral polygon need not be a convex polygon : it could be concave or even self - intersecting . </P>
a polygon with all sides the same length is said to be
a polygon with all sides the same length is said to be
equilateral
equilateral