A rhombus. (Looks like a diamond.)
A rhombus
Draw a square / rectangle, a quadrangle is just a shape with 4 sides, as long as one is a right angle your golden
I am a rectangle
A parallelogram or a rhombus
A rhombus.
Such a quadrangle cannot exist. The right angle must be formed by one of the parallel sides and one of the non-parallel sides. Then the angle formed at the other end of that non-parallel side would also be a right angle (the non-parallel side would be a transversal intercepting the two parallels). But then the quadrangle has two right angles, and not just one. No its Trapezoid
The answer depends on what it is that is being summed: the length of the sides or diagonals, the angle measures, something else.
A square.
a trapezoid
A rhombus is a quadrilateral in which all of the sides are of equal length, It is an equilateral quadrangle. If any angle of an equilateral quadrangle is a right angle, then all its angles are right angles. It is also a square. All squares are rhombuses. Some rhombuses are squares. A rhombus is a parallelogram with 4 congruent sides. A square is a rhombus with 4 congruent angles.
A rhombus.
Rhombus