Question

Which expression shows the value of c?

Answer 1

b over sin 45 degrees

b over cos 45 degrees

a cos 45°

a sin 45°

Answer 2

@jim_thompson5910

Answer 3

check your SOH CAH TOA

Answer 4

http://www.mathwords.com/s/s_assets/s126.gif

which one do you think?

Answer 5

sin?

Answer 6

your choices have only cosine and sine functions
so get the cosine of 45 degrees and it's sine too
then solve for "c"

Answer 7

what would be the \(\bf cos(45^o)\ \ \ ?\)

Answer 8

.7.07

Answer 9

You don't sovlve they just ask what expression shows it @jdoe0001

Answer 10

yes, so in YOUR TRIANGLE, what would be the \(\bf cos(45^o) \)?

Answer 11

cos(45)=.707 if thats what your asking

Answer 12

well, ahemm , yes \(\bf \cfrac{\sqrt{2}}{2} = 0.707\) that's a value for the Unit Circle
but we want to know the cosine of 45 degrees in YOUR triangle, the one you have there
it'll be an expression in terms of "a" or "b" and "c"

Answer 13

keeping in mind that \(\bf cos(\theta) = \cfrac{\textit{adjacent side}}{\textit{hypotenuse}}\)

Answer 14

I know all this but I cant figure out this one

Answer 15

so for YOUR triangle, \(\bf cos(45^o) = \cfrac{\textit{YOUR adjacent side}}{\textit{YOUR hypotenuse}}\)

Answer 16

adjacent side of an angle, is the "shorter leg" coming out of it

Answer 17

hypotenuse of an angle, is usually the "longer leg" coming out of it

Answer 18

and the opposite side, is the side "facing off" the angle

Answer 19

is it answer b?

Answer 20

well, we dunno, we'd need to find the cosine and sine first

Answer 21

once you have both, cosine and sine, you can then solve for "c"

Answer 22

I got it now. Thanks

Answer 23

yw