Two pairs - they are opposite one another.
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It has 2 pairs of opposite equal angles which are acute and obtuse.
All 4 sides of a rhombus are equal in length
A rhombus has four equal sides, but it is not necessarily a square. Think of it as a square that can be stretched. Thus, it will have four angles and opposite angles will be the equal. A special case of a rhombus is a square and then, all four angles will be equal 90 degrees.
A rhombus has two equal pairs of opposite parallel sides
A rhombus has two pairs of equal opposite parallel sides