a trapezoid
a right angle triangle.
It could be a right angle triangle
parallelogram
rectangle
A trapezoid would fit the given description
A right angle triangle.
A rhombus, (or a square if there's a right angle).
d
Right angle triangle, yup that's right
In plane geometry, a shape with four sides, two of which are parallel and have the same length, cannot have a reflex angle.
I'm sorry there is no possible way to make a parallel lines form a right angle in any sort of shape unless u where to bend one of the lines in which case they would no longer be parallel.
It is a triangle