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In plane geometry, a shape with four sides, two of which are parallel and have the same length, cannot have a reflex angle.
An irregular pentagon.
No, a trapezium cannot have a right angle. A trapezium is a quadrilateral with at least one pair of parallel sides, but it does not have any restrictions on its angles. A right angle measures 90 degrees, which would imply that the non-parallel sides of the trapezium are perpendicular, making it a different shape altogether, such as a rectangle or a square.
A right angle triangle
A right angle trapezoid has 2 right angles, an acute angle and an obtuse angle It has a pair of opposite parallel sides of different lengths The 4 interior angles add up to 360 degrees