Contradiction of a statement? My textbook has asked me to find the "contradiction" of a given statement but I have not learned to do such a thing and googling has not yielded in any results whatsoever. Exactly what is the contradiction of a statement and how to form it, given any statement? 

Edit: This is the problem in question:


  "Write the converse, contrapositive and contradiction of the statement "If ∆ABC is right angled at B, then AB²+BC²=AC²"


The answer for the contradiction of this statement is given as 


  "∆ABC is right angled at B and AB²+BC²≠AC²"
What you seem to be asking, when you (your text) refers to the "contradiction" of a statement, might be better termed as the "negation" of a sentence. For example, if person A declares $p$, another person B would be contradicting A by declaring "not $p$. That is, person B is asserting the negation of $p$.

So, we have a sentence we'll call $p$.  It's negation is simply $"\lnot p".$
So if we know that $p$ is true, its negation would be false.

If the sentence (proposition), for example, is "$x$ is an odd number", it's negation would be "it is not the case that $x$ is an odd number," or equivalently, its negation would be "$x$ is an even number."
But the original post asked for the contradiction of a statement, not just a statement that "is" a contradiction.