A square or a rectangle
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A rectangle or a square.
The sum of the interior angles of a quadrilateral is 360 degrees. If three of the angles are right angles, that is, of 90 degrees each, the the fourth must be 90 degrees. So you can have a quadrilateral with three right angles but its fourth angle will also be a right angle. So exactly 3 right angles is not possible.
The sum of the exterior angles of a polygon equals 360.Quadrilateral has 4 exterior angles.360/4=90 for a regular quadrilateral.
Lots of them, since there's nothing in the definition of quadrilateral that says each side must be equal. I've never heard of a particular name for one in English though.
No. in a rhombus the angles are not 90 degrees. also in a parallelogram they are not 90 degrees