Wed December 07, 2011 By:

how to proove 90 degrees angle

Expert Reply
Wed December 07, 2011
To prove some angle is 90 degrees ,we use the converse of pythagoras theorem.
Which States: If in a traingle a2+b2=c2,holds:
then the traingle is right-angled at C,i.e angle C=90 degrees.
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