square
Any parallelogram, including rhombus, but not including rectangle or square.
Rhombus!
Such a quadrangle cannot exist. If the quadrangle's angles are equal, they must be 90 degrees.
You are a rectangle! Note that it does not say all of your sides are of equal length.
The opposite sides in a parallelogram are parallel and the same length. However, they are not angles at 90 degrees (right angles).
A Rhombus
Yes. A parallelogram is defined as having opposite sides that are parallel and equal in length, and opposite angles that are equal.
square
A shape with opposite sides parallel and of the same length and four right angles is a rectangle.
A quadrilateral with 4 right angles and opposite sides that are parallel can be either a rectangle if the adjacent sides are of different length or a square if the adjacent sides are of the same length.
quadrilateral--a four-sided figure, any length sides, any angles trapezoid--one pair of parallel sides, any length sides, any angles parallelogram--two pairs of parallel sides, opposite sides congruent, opposite angles congruent rectangle--two pairs of parallel sides, opposite sides congruent, all angles are right angles (90 degrees) rhombus--two pairs of parallel sides, all sides congruent, opposite angles congruent square--two pairs of parallel sides, all sides congruetn, all angles are right angles (90 degrees)
rhombus