square
Not all 4 sided quadrilaterals have lines of symmetry.
Not all 4 sided quadrilaterals have lines of symmetry although some of them do have lines of symmetry.
Parallelograms
A square
Squares.
No.
Types of quadrilaterals that have lines of symmetry: squares, rectangles, some rhombuses (standard diamond shape), boomerang shape, and trapezoids.
A square
Rhombus
yes
trapezoid for one
No it is not true but all quadrilaterals have 4 sides. But a square has 4 lines of symmetry and 4 equal sides.