a quadrangle with only one right angle
Such a quadrangle cannot exist. The right angle must be formed by one of the parallel sides and one of the non-parallel sides. Then the angle formed at the other end of that non-parallel side would also be a right angle (the non-parallel side would be a transversal intercepting the two parallels). But then the quadrangle has two right angles, and not just one. No its Trapezoid
I'm guessing a right-angled quadrangle.
how do you draw a quadrangle that has at least 1 right angle.
If the question is about only one right angle, then the answer is a kite, arrowhead or a miscellaneous quadrangle which has no specific name.
its akite
a square
A square
You are a square?
A rhombus for example
Most quadrangles do not have right angles. A rhombus is one example.
A trapesium.