Question

Which statement is true? 1) all rectangles are squares. 2) all parallelograms are rectangles. 3) all quadrilaterals are parallelograms. 4) all parallelograms are quadrilaterals.

Answer 1

Well, a square has 4 equal sides and some rectangles don't so 1) is false.
Most parallelograms have no right angles and rectangles do so 2) is false.
Obviously, some quadrilaterals don't have parallel sides so 3) is false.
Which leaves 4) (both 4 sided polygons).

Answer 2

4) all parallelograms are quadrilaterals.