Question

John wrote a statement as shown below.

If the diagonals of a quadrilateral are not congruent, then it is not a square.

Which of these is logically equivalent to it?
Answer
If the quadrilateral is a square, then its diagonals are congruent.
If the diagonals of a quadrilateral are congruent, then it is a square.
If the diagonals of a quadrilateral are congruent, then it is not a square.
If the quadrilateral is not a square, then its diagonals are not congruent.

Answer 1

Its either If the diagonals of a quadrilateral are congruent, then it is a square.
orIf the quadrilateral is a square, then its diagonals are congruent. .......

Answer 2

I believe its the later one though because thats the contraposotive