Ok, so what you're going to do is add the -6 to the other side and combine it with the number 2 making it 8, then you are going to subtract the 5k from the left side and add it to 3k so if you now have a -5k + 3k it would = -2k then you would take the 8=-2k and divide each side by -2 which leaves you with -4=k
Answer:
The correct option is C ) 109.5°
Therefore,
Step-by-step explanation:
Given:
In Triangle DEF
d = 10
e = 18
f = 12
To Find
angle E = ?
Solution:
In Triangle DEF , Cosine Rule says
Substituting the values we get
Therefore,
............As it is in Second Quadrant
Therefore,
Answer:
it's option A .............