A rhombus is a quadrilateral (4 sided polygon) with 4 sides equal in length. The rhombus is a special case of parallelogram, so the opposite angles are equal, and adjacent angles are supplementary (add up to 180°).
A square is a rhombus which also has all 4 angles equal to 90°.
that's a square
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A parallelogram can have four equal sides that will not meet at right angles. The term diamond can also be used in this context.
rhombus
A rhombus.
A square.
A rectangle is a plane figure with four straight sides and four right angles, esp. one with unequal adjacent sides. A square is a plane figure with four equal straight sides and four right angles. A rhombus is a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.