If shapes are equal then they are said to be congruent
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Any regular shapes have equal sides, including squares and equilateral triangles. Irregular shapes can also have equal sides, but not equal angles.
No, octagons just have to be closed shapes with eight sides - the sides do not have to be of equal length.
Square.
hexahedron
some shapes tile and some don't because if the side angles don't equal a factor of 360 degrees it will not tile and if the side angles do equal a factor a 360 degrees it willtile.