A) All its angles are acute
B) One angle is obtuse
C) Triangle is right angled
D) None of these
Correct Answer: B
Solution :
\[\cos C=\frac{{{3}^{2}}+{{5}^{2}}-{{7}^{2}}}{2\times 3\times 5}\Rightarrow C=120{}^\circ \].You need to login to perform this action.
You will be redirected in
3 sec