It is a right angle triangle
It can but need not.
A right trapezoid.
right angle triangle
No, no! A RIGHT angle is 90 degrees.
Any polygon, if it is not regular, can have 1 right angle.
It is a right angle triangle
polygon
A right angle triangle
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Any polygon with 4 or more sides can always have a right angle.
It can but need not.
No a quadrilateral can't have 3 obtuse angles and 1 right angle because if a polygon did have 3 obtuse angles and 1 right angle then it would not even be a quadrilateral.
There are lots of polygons like that. If by 1 right angle, you mean exactly 1 right angle, there are no such quadrilaterals, but there are pentagons (in fact n-gons for all n>=5.)
A right trapezoid.
either an obtuse, acute, or right angle
right angle triangle