A right sided triangle.
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How do you draw a one-quarter right- angle turn
yes, you can draw a quadrilateral with on right angle because all sides don't have to be equal for a regular one _ /Right Angle l l l l l/ --------------------------------------------------------------------------- A quadrilateral is a polygon with four sides, so yes. You can use only one right angles, if the polygon has four sides.
OK, got it! What's the next step ?
A right angle triangle
Yes. The easiest way to do so is draw a line, then have a right angle at each end, and from the resulting lines draw the final line so it does not form two further right angles. Basically you have 360 degrees to work with. you use 180 degrees up for your two right angles. Now you have 180 degrees left over to work with. you can have one angle be acute (say 30 degrees) and one angle be obtuse (say 150 degrees). This gives you your 2 right angle, non rectangle, quadrilateral.