if a 75kg sofa is on the 50th floor of a luxury apartment building. in apartment #5013 (300m up). The door of the apartment is 200ft to the left as you exit the elevator. what is the potencial energy of the sofa.

C. If a polygon is not called a quadrilateral, then it does not have four sides.

Step-by-step explanation:

If P ⇒ Q is a statement, then the contra positive of this statement is:

not Q ⇒ not P.

A statement and its contra positive are equivalent.

The given statement is :

"If a polygon has four sides, then it is called a quadrilateral."

The contra positive of the above is:

"If a polygon is not called a quadrilateral, then it does not have four sides" which is given in (C).

Hence, the correct option is (C).