Question #02641

1 Answer
bp
Oct 14, 2015

yes

Explanation:

Law of cosine is applicable to any triangle. Right angle triangle is one of them. Suppose ABC is any triangle then

Cos C= #(a^2 +b^2 -c^2)/(2ab)# Cos C would be zero if #a^2+b^2 -c^2=0#. This shows that #a^2+b^2=c^2# when Cos C =0. Hence Angle C is 90 degrees.

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