Answer:

Step-by-step explanation:
we know that
The formula of law of cosines is equal to

where
a, b and c are sides. C is the angle opposite side c
In this problem we have

substitute the given values






Answer: this is difficult
Step-by-step explanation:
Answer:
144 and 12.
Step-by-step explanation:
144 is close to 147 and 12 is close to 13.
Moreover, we can easily divide 144 and 12 using mental health i.e 144 ÷ 12 = 12
Answer:
I don't understand your question