What is tangential used in a scentence? i need

During the student’s presentation, she was so nervous her speech was filled with tangential thoughts that were not related to each other.
I hardly ever learn anything in my history class because my teacher always rambles off on a tangential topic that has nothing to do with history.
Our team lost the debate because our responses were tangential and did not respond to our opponent’s position on the subject.

Ok so Tangential means off topic, random. 
so if we try to use this in a sentence it would be:
the student was preparing her speech but she had tangential thoughts.
i hope this helps u.

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