Question

Megan wrote the statement shown below.

If a quadrilateral is a rectangle, then its diagonals are not perpendicular.

Which of these is logically equivalent to it?
Answer

If a quadrilateral is not a rectangle, then its diagonals are perpendicular.

If a quadrilateral is not a rectangle, then its diagonals are not perpendicular.

If the diagonals of a quadrilateral are not perpendicular, then it is a rectangle.

If the diagonals of a quadrilateral are perpendicular, then it is not a rectangle.

Answer 1

If the diagonals of a quadrilateral are perpendicular, then it is not a rectangle.
logic form:
if a is true, then b is true.
If b is false, then a is false.
I believe that is the contrapositive.