Question

4. What information do you need to classify quadrilateral EFGH as
a square?

Answer 1

i think area of quad=area of square(equal sides)

Answer 2

opposite angles are congruent.
opposite sides are congruent.
adjacent angles are supplementary.
the diagonals bisect each other.

if a quadrilateral has four congruent sides and four right angles, then it is a square.