Question

Use the Law of Cosines to find the missing angle.
Find m 11 years ago

Answer 1

I!!

Answer 2

hi!!

Answer 3

you need A right?

Answer 4

\[\cos(A)=\frac{b^2+c^2-a^2}{2bc}\] plug and chug

Answer 5

Hi! and yes, please.

Answer 6

you need a calculator for sure

Answer 7

I use mathway for a calculator. but it's not telling me the correct answer I need.

Answer 8

lets do it in one step

Answer 9

Okay!

Answer 10

ok two steps!

Answer 11

first we check to see that this is the right input http://www.wolframalpha.com/input/?i=%2827%5E2%2B41%5E2-23%5E2%29%2F%282*27*41%29

Answer 12

Is this an example?

Answer 13

this is what you had

Answer 14

i write
\[\frac{b^2+c^2-a^2}{2bc}\] with your numbers

Answer 15

Oops, yeah I'm sorry misread it.

Answer 16

i think i did it right , check

Answer 17

i don't mean check the arithmetic, i mean check that the numbers are in the right spots

Answer 18

but you want A, not \(\cos(A)\) so take the arc cosine of that number

Answer 19

I think I know the answer.

Answer 20

this is pretty much work for calculators, not math but here is my answer
http://www.wolframalpha.com/input/?i=arccos%28%2827%5E2%2B41%5E2-23%5E2%29%2F%282*27*41%29%29

Answer 21

you got this ?