It can, but they can also all be the same.
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a quadrilateral
square
A rectangle is generally defined as a quadrilateral with four right angles. No rectangle can have four different side lengths by that definition. Finding the area of such a shape is therefore impossible.
NO!!! It can be a Rhombus. Square ' 4 equal sides and four angles at 90 degrees. Rhombus' 4 equal sides, but no angles at 90 degrees.
You know that at least one of them must be acute. A quadrilteral can have three obtuse angles, but not four.