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goformit100
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ya say
agillogly
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goformit100
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solve it by cosine rule
agillogly
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I don't know how to.
kr7210
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|dw:1339191253421:dw|
kr7210
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use it
agillogly
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How? I don't have all the measurements.
alanli123
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You don't need all the measurements
alanli123
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One sec
alanli123
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|dw:1339195102769:dw|
alanli123
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You know what b, c, and angle theta are. all you have to do is plug it in and solve for a
agillogly
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Okay
agillogly
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I got 130.9 and that isn't and option.
alanli123
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one sec
alanli123
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Could you explain to me how you got your answer?
agillogly
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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.
alanli123
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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)
alanli123
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You did -2(7), the correct term should be -2(7)(9) because it is -2ab
agillogly
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Okay. I thought I forgot a number. Ill try it again.
agillogly
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187.20?
alanli123
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Yes!
kr7210
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|dw:1339192083258:dw|
alanli123
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You are correct!
kr7210
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found ur answer?
alanli123
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Medal please lol
agillogly
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I picked 187.2 and it said the correct answer is 13.68.
kr7210
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answer is 187.20