a square
No. The sides of a shape don't need to be equal in length to be parallel.
A square or a rhombus
triunghiul echilateral
A shape with opposite sides parallel and of the same length and four right angles is a rectangle.
A Paralellogram
a rectangle. it has four parallel sides each side is the same length as the one on the other side.
A kite
A trapezoid has at least one set of parallel lines, but they need not be the same length. Here is a picture of one with parallel sides, but clearly not the same length Dr. Chuck (picture is from http://illuminations.nctm.org/LessonDetail.aspx?ID=L580)
A square or a rhombus
Not exactly. They are two names for the same shape. The typical shape consists of a four-sides figure with opposite sides (and angles) equal. Each pair of parallel sides are the same length.
A trapezoid
A kite