It always has 4 equal sides but not 4 equal angles because it has 2 equal opposite acute angles and 2 equal opposite obtuse angles. The 4 interior angles add up to 360 degrees
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Yes. The rule for a rhombus is that it has equal sides, while a square is just like it, except also with right angles. So a square is always a rhombus, but a rhombus isn't always a square.
No, although a rhombus has 4 equal sides but the angles are not equal
Never. A rectangle has 2 pairs of equal sides and four right angles whereas a rhombus has all sides equal and 2 pairs of equal angles.
No. A rhombus has equal sides but is not regular because its angles aren't equal.
No. A quadrilateral is a polygon with four sides - of any length. A rhombus has four equal sides, a square has four equal sides AND four right angles. Incidentally, four equal sides for a rhombus implies two pairs of parallel sides and equal opposite angles, so those facts are not required to define a rhombus.