Trigonometric Equations Question 200
Question: In $ \Delta ABC, $ if $ a=16,b=24 $ and $ c=20, $ then $ \cos \frac{B}{2}= $
[MP PET 1988]
Options:
A) 3/4
B) 1/4
C) 1/2
D) 1/3
Show Answer
Answer:
Correct Answer: A
Solution:
- $ 2s=a+b+c $ ; $ \cos \frac{B}{2}=\sqrt{\frac{30\times 6}{320}}=\frac{3}{4} $ .
BETA
