Question:
What is ÐB equal to?
What is ÐB equal to?
Options:
- a) 60°
- b) 105°
- c) 120°
- d) 150°
- a) 60°
- b) 105°
- c) 120°
- d) 150°
correct answer : c)
Explanation:
cos B = ac b
ac
22 2
2
+-
= 25 94 9
25 3
+-
××
= – 1
2
B = 120°
cos B = ac b
ac
22 2
2
+-
= 25 94 9
25 3
+-
××
= – 1
2
B = 120°