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@radar

- anonymous

who opens .docx anymore?

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## More answers

- anonymous

you can open do docx

- anonymous

you need to use trigonometric functions

- anonymous

i got cos 50=x/90 right

- anonymous

so i got 57.9

- anonymous

The cosine of a 50° angle is 57.9 right

- anonymous

which part the first blank is asking which function to use to find the height

- anonymous

part 1 i think its cosine

- anonymous

if yo are using cos(50)=x/90

- anonymous

yes that's what i did

- anonymous

and i got 57.9

- anonymous

then the next part is asking for the reverse how do you find the cosine function with the two sides

- anonymous

57.8

- anonymous

then input the cosine of 50 in your calculator for the next blank

- anonymous

its asking this this represents the value created when length _____ is divided by ______ feet.

- anonymous

the angle is the value when you divide the sides accordingly

- radar

Cos 50 degrees is 0.6428

- anonymous

The cosine of a 50° angle is 57.9 is this right for the second part

- anonymous

all the trig functions are is a relationship between the lengths of sides if you divide two known sides and take that data it represents and angle.

- anonymous

so like radar has said the cosine of 50 is .6428
so the sides divided are also .6428

- anonymous

57.8 is the height of the tower because you multiplied the hypotenuse by the cosine to find x

- anonymous

so it will be .6428x.6428

- radar

Cos is the adjacent side divided by the hypotenusel.

- anonymous

what happens if you divide the side x by the side of 90

- anonymous

adjacemt side is x right
and hypotenusel is 90

- anonymous

so 57.8 divided by 90

- anonymous

that's what i got

- radar

\[\cos 50^{0}=x/90 ft\]

- anonymous

you get .6422

- anonymous

i got 57.9

- anonymous

roughly the same as the cosine for 50 degrees

- radar

\[x=.6428 \times90\]

- anonymous

|dw:1349577896978:dw|

- anonymous

that is what we have so far

- anonymous

so it would be 57.9

- anonymous

so x side is 57.9

- radar

Yes

- radar

when angle was 50 degrees

- anonymous

\[\cos(50^{0})=\frac{ adjacent }{ hypotenuse}\]

- anonymous

The cosine of a 50° angle is .6422 right

- anonymous

the first question only wanted to know that you would use the cosine function to find x

- anonymous

the next blank wants you to input the cosine of 50 which you have .6422

- anonymous

its .6428

- anonymous

yes if you type in cos50 in your calculator that is what you get

- anonymous

this represents the value created when length ____ is divided by ____ feet.

- anonymous

so what about this one

- anonymous

if you look at the funtion you know that it is x divided by the 90 feet if you divide the value you got for x by 90 it is about the same as cos 50

- anonymous

when length is 50 is divided by x feet right

- anonymous

no 50 is the angle you want the height of the tower divided by the lenght of the decline which is 90

- anonymous

when length is 90 divided by x feet

- anonymous

|dw:1349578522617:dw|

- anonymous

right

- anonymous

see how it is lenght x divided by 90 feet

- anonymous

ok i see now
x/90

- anonymous

that is a balanced equation if you divide that you get the same value as you did when you input cos of 50 into your calculator

- anonymous

ok

- anonymous

If the angle of declination changed to 60°, the cosine would be 0.5; now the length of x would be ________ feet.

- anonymous

use the same equation with the cos of 60 instead

- anonymous

so its gonna be cos(60)=x/90

- anonymous

\[\cos(60^{0})=\frac{ x }{ 90ft }\]

- anonymous

so now you need to solve for x

- anonymous

so it would be 45

- anonymous

yes one more blank left

- anonymous

there is two ways to solve for this but you are suppose to use a trig function

- anonymous

there are srry

- anonymous

0.5

- anonymous

If the angle of declination changed to 60°, the angle of inclination would be _____ degrees.

- anonymous

no it wants to know the angle of inclination which is the angle from the bottom

- anonymous

|dw:1349579030126:dw|

- radar

|dw:1349579070499:dw|

- anonymous

the angel theta is unknown do you know which trig function to use to solve it

- anonymous

not sure

- anonymous

so theta is 60 degrees right

- anonymous

if you look at the trig functions there are sin=opposite / hypotenuse cos which we covered and tangent = opposite / adjacent

- anonymous

ok

- anonymous

so you want to use the sine function

- radar

From reading the problem, I believe you could solve simply from the fact you are working with a right triangle, and the sum of the two acute angles equals 90 degrees.

- anonymous

|dw:1349579230668:dw|

- anonymous

so apposite side is 45 right

- anonymous

yes

- anonymous

so we trying to find the bottom right

- anonymous

yes the bottom angle

- anonymous

on your calculator you push the 2nd button then 45/90

- anonymous

i got 0.5

- anonymous

you need the inverse sine of .5 which is 2nd sin .5

- anonymous

are you using a ti calculator

- anonymous

no my iphone

- anonymous

you need to look for \[\sin ^{-1}\]

- anonymous

ok

- anonymous

you press sin ^-1

- anonymous

and than 45/90

- anonymous

is that a button

- anonymous

yes
its sin^(-1)

- anonymous

yes what do you get when you put that in

- anonymous

0.5

- anonymous

.5 is what you get when you do the division without the sine function I am not sure what your calculator is doing

- anonymous

when you get the true inverse sine you will get 30 degrees

- anonymous

i got 30

- anonymous

that is correct know do you notice that the 30 you got and the 60 degree other angle add up to 90 and the right angle is also 90 every triangle has 180 degrees in it so you could have just found the missing amount from 180

- anonymous

http://www.youtube.com/watch?v=T8B8Tcz8kog&feature=related

- anonymous

that is a link to a tutorial that might be able to help

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