It is the opposite of a statement...kinda... It is used in if then statements. Let me explain: Statement: If cardinals are red, then a dog is a cardinal. The contrapositive of that statement would be: If a dog is not a cardinal, then it is not red. Notice how you switch the order of if and then in the sentence. Then you insert the nots. To make the sentence true of false. I took geometry a while ago, sot his may not be accurate, but I hoped it helped!
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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.
A conditional statement is true if, and only if, its contrapositive is true.
It may or may not be true.
not b not a its contrapositive