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A square?

No, because a square is a special case of a rectangle: it's a rectangle that has four sides which are all the same length.

A rhombus?

No, a rhombus has 4 equal sides but does not have any right angles at its corners, so the answer to this question cannot be a rhombus.

There is no answer to this question for 2-dimensional geometry, which is only for figures on a flat plane.

To get the right answer you have to consider 3-dimensional geometry, for which a simple example is a sphere such as a globe map of the world. On a globe you can easily draw lots of squares that have four right angles at their corners, in lots of different sizes.

(You can also draw lots of rectangles, but they are not part of this answer!)

So the correct answer is:

A square drawn on the surface of a sphere has four right angles but is not a rectangle.

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Q: What has four right angles but is not a rectangle?
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