Quadrilateral. No other special name. A kite could have 1 right angle - that's possible, but there is no special name for a quadrilateral with only 1 right angle.
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An irregular quadrilateral.
A right-angle triangle.
A trapezoid is a quadrilateral which has two parallel sides.
The measure of 1 exterior angle of a regular 8-sided polygon is equivalent to 45 degrees. Hope I helped! :)
A right angle triangle