Look at the statement If 9 is an odd number, then 9 is divisible by 2. The first part is true and second part is false so logically the statement is false. The contrapositive is: If 9 is not divisible by 2, then 9 is not an odd number. The first part is true, the second part is false so the statement is true. Now the converse of the contrapositive If 9 is not an odd number, then 9 is not divisible by two. The first part is false and the second part is true so it is false. The original statement is if p then q,the contrapositive is if not q then not p and the converse of that is if not p then not q
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A conditional statement is true if, and only if, its contrapositive is true.
conditional and contrapositive + converse and inverse
A Contrapositive statement is logically equivalent.
The contrapositive would be: If it is not an isosceles triangle then it is not an equilateral triangle.
If a figure is not a triangle then it does not have three sides ,is the contrapositive of the statement given in the question.