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.
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It is a parallelogramIf one of the angles is a right angle (then they all are) and the quadrilateral is a rectangle.If both pairs of sides are equal in length (but none of the angles is a right angle) the quadrilateral is a rhombus.If the sides are equal and one of the angles is a right angle, the quadrilateral is a square.
A bit like a chevron or an arrowhead.
Yes. Not here, of course, but it can be done. Draw a right angle. Draw two more lines from those end points at acute angles that connect in the middle. It will look something like a chevron, a "V" shape.
An equiangular quadrilateral is a four-sided figure with all angles equal. To draw an equiangular quadrilateral that is not regular, you would need to create a shape where all four angles are equal but the side lengths are not necessarily equal. One way to do this is to draw a square and then elongate one pair of opposite sides while keeping all angles at 90 degrees. This will result in a shape that has equal angles but different side lengths, making it an equiangular quadrilateral that is not regular.
Squares are special cases of rhombuses, ones in which all the internal angles are the same (90°). So no, you cannot draw a square that is not a rhombus. It's a bit like trying to draw a square that is not a quadrilateral. Squares are special cases of quadrilaterals.