The contrapositive of the following conditional statement: If a figure has four sides, then it is not a triangle.

Question

A.If a figure does not have four sides, then it is a triangle.
B.If a figure is a triangle, then it does not have four sides.
C.If a figure is not a triangle, then the figure has four sides.
D.If a figure does not have four sides then it is not a triangle.
E.None of the above.

My answer: A

Answer 1

I have to write this on my brain first:

hypothesis: If a cow, then a mammal
converse: If a mammal, then a cow (maybe)
inverse:If not a cow then not a mammal(maybe)
contrapositive: if not a mammal, then not a cow - TRUE
ok, now
Hypothesis: if 4 sides, then not a triangle
converse: if not a triangle, then not four sides (maybe)
inverse: If not four sides, then a triangle(maybe)
Contrapositive: If a triangle, then not 4 sides (TRUE)
so I think B

Answer 2

converse:
if not a triangle, then four sides (maybe)