Question

Geometry help please ... due 2 weeks ago.
*picture attached to question.*

Answer 1

How did you get your answer to #4 ?

Answer 2

idk the tutor wasnt very good i just put what she said...

Answer 3

@TuringTest

Answer 4

well you can simply use the inverse cosine function\[\cos(\theta)=x\iff\theta=\cos^{-1}x\]I assume you have this function on your calculator?

Answer 5

yeah

Answer 6

ok, and what do you get?

Answer 7

what is the zero supposed to be?

Answer 8

@TuringTest

Answer 9

zero? you mean theta \(\theta\) ? that's a greek letter that we use to represent the angle

Answer 10

so what am i supposed to put in my calculator

Answer 11

well what is x in your case? what is theta in your case?

Answer 12

what number are u looking at?

Answer 13

@TuringTest
what number r u on from the picture?

Answer 14

#4

Answer 15

is 4 wrong?
@TuringTest

Answer 16

yes , #4 is wrong.

Answer 17

so how do I solve 4?

Answer 18

Turing already told you how , just go back and read what he wrote

Answer 19

So it's Cos (2*25)= ??? im getting weird decimals

Answer 20

why did you put 2*25 as an argument for cosine? How does that relate to what I told you?

Answer 21

I never fully understood ^^?

Answer 22

exactly where did I lose you?

Answer 23

I'm not dumb I just need to know the layout and steps so I can plug in numbers and learn it.

Answer 24

Nobody said you were dumb, I just need to know where you got confused so I can help you.

Answer 25

well you can simply use the inverse cosine function
cos(θ)=x⟺θ=cos−1x
I assume you have this function on your calculator?

this is where i got lost.

Answer 26

Cosine is a function that outputs a value between -1 and 1 for any angle - > cos(theta)
the symbol Theta , represents angle , measured in degrees .

example :
cos(45) = sqrt(2)/2 = 0.7071

Answer 27

oh yes . sorry

Answer 28

nevermind I was wrong lol

Answer 29

I was relectant to disagree , loooked over and yes . I am correct .

Answer 30

what is going on exactly?

Answer 31

yeah sorry @Mrhoola I'm a bit tired :P
anyway, cosine is a function that takes an angle and outputs a number between -1 and 1

so \(\cos\theta=x\) means if I put \(\theta\) in the function I get \(x\)

in #4, what is your \(theta\) and what is your \(x\) ?

Answer 32

what is your \(\theta\) *

Answer 33

here is what you have:\[\cos\theta=\frac2{25}\]here is the formula I am telling you:\[\cos\theta=x\]so what is your \(\ x\) ?

Answer 34

so 2/25 is 0 or x or 2/25 is cos?

Answer 35

\[\text{ what number can you replace } x \text{ with so that } \\ \cos(\theta)=x \text{ reads the same as } \cos(\theta)=\frac{2}{25}\]

Answer 36

1?

Answer 37

i dont see a theata or 0 thing on my calcutalor

Answer 38

replacing x with 1, that would result in \[\cos\theta=1\]we want \[\cos\theta=\frac2{25}\]

Answer 39

so 2/25?

Answer 40

you don't need a symbol for theta because that is what we are trying to find, don't worry about htat

yes, x=2/25

now back to what I said earlier...

Answer 41

\[\cos\theta=x\iff\theta=\cos^{-1}x\]and you should have the function \(\cos^{-1}\) on your calculator (it may be called \(\arccos\))

Answer 42

do you have that function on your calculator?

Answer 43

cos -1 (2/25) = 85.41

Answer 44

D.

Answer 45

So how do I start #5?

Answer 46

do you see a button that says cos^ -1

Answer 47

good, D is correct

Answer 48

for number 5 you should start a new thread. we only allow one question per thread

Answer 49

okay

Answer 50

I hope I helped you understand how to solve these problems. Please don't forget to rate me as a QH :)