Letter L unless you count the ends as additional sides
An irregular quadrilateral, such as certain trapezium.
should that be trapezia or trapeziums?
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This shape has only one pair of opposite sides and no right angles: <
A shape with five sides would be a pentagon, but a shape can not have 5 right angles. Squares and Rectangles are both shapes with 4 sides and 4 right angles. They are the only shape with the same amount of right angles as there is sides.
A rectangle is the only such shape. Not sure about the "little" right angles: all right angles are of the same measure.
Any shape with more than 3 sides can have two pairs of equal sides and no right angles. If it only has 4 sides in total and isn't a parallelogram, then it's a trapezoid.
Yes, all trapezoids have 4 sides anyhow. The two right angles would have to be consecutive and the only right angles in the polygon to maintain a trapezoidal shape.