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ya say

solve it by cosine rule

I don't know how to.

|dw:1339191253421:dw|

use it

How? I don't have all the measurements.

You don't need all the measurements

One sec

|dw:1339195102769:dw|

You know what b, c, and angle theta are. all you have to do is plug it in and solve for a

Okay

I got 130.9 and that isn't and option.

one sec

Could you explain to me how you got your answer?

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.

187.20?

Yes!

|dw:1339192083258:dw|

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