Trigonometric Equations Question 17
Question: If $ a=2,b=3,c=5 $ in $ \Delta ABC $ , then C =
[EAMCET 1984]
Options:
A) $ \frac{\pi }{6} $
B) $ \frac{\pi }{3} $
C) $ \frac{\pi }{2} $
D) None of these
Show Answer
Answer:
Correct Answer: D
Solution:
- $ \cos C=\frac{a^{2}+b^{2}-c^{2}}{2ab}=-1 $
Þ $ \angle C=180^{\circ} $ , which is inadmissible in a triangle.
BETA
