Question

I'm not sure how to put my problem down..

Answer 1

Hmm, maybe use the "snipping tool" to clip the problem and save it. Then, go on OpenStudy and click the "Attach File". Choose the picture of the math problem, and upload it. That's what I usually do. I'll help you more if I can.

Answer 2

Find the length of a.

I couldn't figure out how to save a picture of my problem (it's on word), but I drew it. I have absolutely no clue how to do this. I've been MIA the entire unit.

Answer 3

@Hero ? anyone? :/

Answer 4

Use law of cosines to find a

Answer 5

I would if I knew how. :/ I've been missing days and I'm behind so I haven't been taught it...

Answer 6

All you do is take the formula, isolate a, then input the rest of the known values in to it. It's essentially plug and play

Answer 7

Is the formula c = sqrt of a^2 + b^2 - 2ab cos(108) ?

Answer 8

Are a,b, & c the side lengths? Sorry, I really have been absent for about 3 units of the class.

Answer 9

Yes

Answer 10

Actually, I realized you should have used the formula for a:
\[a = \sqrt{b^2 + c^2 - 2bc\cos A}\]

Answer 11

And all you have to do is just plug in the values:

b = 12
c = 11

\[a = \sqrt{(12)^2 + (11)^2 - 2(12)(11)\cos(108)}\]

Answer 12

You can plug the entire contents of the right side on to your calculator and compute a as one computation.

Answer 13

do I plug in 11 for c? and would 12 be plugged in for b?