2 right angles add up tp 180 degrees
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Yes, a quadrilateral just need to have 4 sides. Quad- means 4 and -lateral means sides. To have only one tight angle, it has to be either a right angle with 2 acute angles and 1 obtuse angle OR a right angle with 2 obtuse angle s and 1 acute angle.
A triangle can have a right angle and two acute angles with all three angles adding up to 180 degrees.
What about the other angle(s). You need at least 3 sides and 3 angles to make a closed figure.
I'm not positive about my answer but I believe you can sort them by their angles. It can be a right angle, a triangle with angle/s exactly 90 degrees, an obtuse angle, a triangle with angle/s more than 90 degrees but less than 180 degrees. Last but certainly not the least, there is an acute angle, a triangle with angle/s less than 90 degrees. This is what I think is the answer to your question. If I didn't help you, please try to understand that: I'm not a smart person and if I was, I would've given you the right answer. I very, truly, positively am sorry if I didn't help you. And sometimes, I feel like people are taking over me so, sorry. (:
Area = s^2*sin(x) where s is the length of any side and x is the measure of any angle.