SOLUTION: c^2=13^2+20^2-2(13)(20)cos27 This is where I don't understand. I know the answer is c^2=105.68, but when I work it out I get 720.9121805, which is nowhere the correct answer. I

Question 185376This question is from textbook saxon algebra 2
: c^2=13^2+20^2-2(13)(20)cos27
This is where I don't understand. I know the answer is c^2=105.68, but when I work it out I get 720.9121805, which is nowhere the correct answer. I am working it straight across. What am I doing wrong? Please help! This question is from textbook saxon algebra 2

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
It's possible that you are working in radian mode where you actually want to work in degree mode.

Start with the given equation.

Square each term.

Evaluate the cosine of 27 to get 0.891 (if you get a different value, then you're in the wrong mode).

Multiply

Combine like terms.

So you're answer is confirmed to be
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