1. Which type of quadrilateral has the largest number of axes of symmetry?

The SQUARE with 4 axes of symmetry.

2. Which quadrilaterals have diagonals that intersect at right angles?

Kite, arrowhead, rhombus and, of course, the square.

3. What is the similarity between an rhombus and a square?

They both have 4 equal sides.

4. What is the similarity between a rhombus and a parallelogram?

They both have opposite ANGLES equal and opposite SIDES are parallel.