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solve it by cosine rule
I don't know how to.
How? I don't have all the measurements.
You don't need all the measurements
You know what b, c, and angle theta are. all you have to do is plug it in and solve for a
I got 130.9 and that isn't and option.
Could you explain to me how you got your answer?
I just tried to plug everything in like you said. 7^2+9^2-2(7)cos(117). I got 136.35. I did something wrong the first time. But its obviously still wrong.
Ok here's where you are wrong. It's 7^2+9^2-2ab cos 117. Can you see where you went wrong? (hint: you're missing b)
You did -2(7), the correct term should be -2(7)(9) because it is -2ab
Okay. I thought I forgot a number. Ill try it again.
You are correct!
found ur answer?
Medal please lol
I picked 187.2 and it said the correct answer is 13.68.
answer is 187.20