1.) side lengths are equal
2.) two sets of parallel sides
3.) two sets of equal angles (opposite angles are equal)
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No, it's not true. A rhombus is a special kind of parallelogram, so only some parallelograms are rhombera.
A rhombus is a special kind of parallelogram: one in which all sides are equal. It is not true to say that a parallelogram is never a rhombus.
Yes. And a square is always a rhombus.
False. A rhombus is always a parallelogram.
A rectangle is sometimes a square, but not always. When it is, it's also a rhombus. A rhombus is sometimes a square, but not always. When it is, it's also a rectangle. A square is always a rhombus and always a rectangle. Rectangles, rhombera, and squares are always parallelograms and quadrilaterals.