<P> The etymology (in Greek παραλληλ - όγραμμον, a shape "of parallel lines") reflects the definition . </P> <Ul> <Li> Rhomboid--A quadrilateral whose opposite sides are parallel and adjacent sides are unequal, and whose angles are not right angles </Li> <Li> Rectangle--A parallelogram with four angles of equal size . </Li> <Li> Rhombus--A parallelogram with four sides of equal length . </Li> <Li> Square--A parallelogram with four sides of equal length and angles of equal size (right angles). </Li> </Ul> <Li> Rhomboid--A quadrilateral whose opposite sides are parallel and adjacent sides are unequal, and whose angles are not right angles </Li> <Li> Rectangle--A parallelogram with four angles of equal size . </Li>

Shape with 4 sides and no right angles