Questions 1, 2 and 4 - Jonathan Then

Question 1 - Yes.

A square is a rhombus as it is a quadrilateral with four equal sides.

But there are rhombuses which are not squares because their angles are not right angles.

Question 2 - D

A square is a regular quadrilateral. It has 4 equal sides.

A parallelogram is a quadrilateral. It has two pair of parallel lines.

A square has 4 equal sides so the opposite side are parallel.

A parallelogram has two parallel lines.

Trapezoid is a four sided figure with one pair of parallel line.

Trapezoid

Question 4 - No, I don't.

All squares are parallelograms, but not all parallelograms are squares.

If all parallelograms are squares, the parallelogram must have equal sides.