what is the tangent ratio for

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|dw:1435093915953:dw|
is H the same as h?
yes

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ok do you know what side is not touching angle H (this is the opposite side) what measurement does this side have?
5?
yes the opposite side measurement is 5 now we just need to identify the adjacent side and it's measurement
the adjacent side is the side touching the angle (that isn't the hyp)
12?
that is right
now you just put your opp/adj and you have your tangent ratio
for angle h that is :)
or H
since H=h
do i do 5/12
yep
it says 0.4166666667
I would leave it as just 5/12
are you suppose to round it ?
oh 5/12 is the answer lol
no lol
yes we already found the tangent of angle h earlier it look like you were trying to round the answer
Thank you!(: can u help me with one more?
maybe
:p
i thought u were telling me to divide the two lol
sorry got confused but the answer is 5/12
well 5/12 is a fraction or a division of 5 by 12 but 5/12 is as pretty as the answer will come for that one since it is a repeating decimal
but anyways what is your other qustion
yeah i see that now thanks
it is triangle ABC, AB= 3 and AC=9. Find M
is this another right triangle?
|dw:1435094633296:dw|
yes
|dw:1435094708365:dw|
i think
yes that is a right triangle (it has a 90 deg angle there)
ok
anyways can you identify the sides that are given with respect to the angle in question (that angle being B)
the words I want you to use are: opposite adjacent hyp
|dw:1435094797116:dw| what side is this in the picture?
opposite?
now you are suppose to be looking at the angle B and I'm asking about the side whose measurement is 3
that side is actually touching the angle in question
adjacent?
yes!
|dw:1435094881006:dw| now what about the side whose measurement is 9
ok so 3 adjacent and opposite 9 and hyp b?
the hyp is the side BC ( the hyp is the side always opposite the 90 deg angle)
but yes to your other questions
oh bc i ment
so we are given opp and adj measurements so I suggest using the tangent ratio again
3/9?
|dw:1435094982296:dw|
opp is 9 and adj is 3 not the other way around
oh so 9/3
yes tan=opp/adj
do i divide?
amyways you want to solve that equation above and actually yeah it is pretty easy to find a prettier form for 9/3 we call that 3 tan(B)=3
now you want to solve for B
so take arctan( ) of both sides
\[\tan(B)=3 \implies B=\arctan(3)\]
how would i solve that on calculator?
my answer choices are 58, 18, 52, 72
well sometimes the arctan( ) can be done by pressing shift (or 2nd) and then the tan button
so put tan(3) then what?
no
arctan(3)
i dont have arctan on my calc
you should see arctan( ) above tan on your calculator
theres in above tan
like in maybe a different color
in?
what kind of calculator do you have?
yea the button says in
maybe I can find a picture of your calculator online and tell you how to use it
it says casio fx-115ES PLUS
OK
according to this calculator you should see arctan( ) above tan( ) they just call it \[\tan^{-1}[ F]\] both of these are the inverse functions of tan they are the same function just different notation
it is below the Ln key that you call in
to access the tan^(-1) thing you need to press shift
got it
i got 79.5
oh it was ln not in oops
you did 3 then arctan( ) and you got 79.5?
79.51672353
you should do something like this: second tan 3 or it might be the other way on yours 3 second tan
http://www.wolframalpha.com/input/?i=arctan%283%29
it tan^-1 then 3
you should be getting 71.57 deg
weird.. nope i got that number above and i typed it in exactly that way..
so the answer is 72?
yea but it is important you figure out your calculator
you might have to use it on a test
well i typed it in right.
so when you typed it all in it said this: \\[\tan^{-1}(3)\]
no other things in it
yep
without /
lol that is not suppose to be there
ok lol but yep thats what i typed
ok hmmm: I looked up your little support pdf for your calculator it says you should do this to find arctan(3): shift tan ) =
i did that too
well cookies!
help please? i believe its 35. A child lies on the ground and looks up at the top of a 17-ft tree nearby. The child is 14 ft away from the tree. What is the angle of elevation from the child to the top of the tree? Round to the nearest whole degree.
yeah thats really weird
1 Attachment
actually i think i got that one but need help with my last question
ok if you insist
Find the value of x to the nearest tenth. 6.0 8.0 10.9 13.3 |dw:1435096370432:dw|
and I did get a different answer for that previous one
well you are given the hyp measurement so you can think about using either sin of cos
sin or cos*
let's look at the angle whose measurement is 53 deg
what is the side whose measurement is x called? choices: adjacent opposite hyp
cos i believe
you did what was it?
adjacent?
I have gotten arctan(17/14) for the previous one I wonder if you are getting something different again on your calculator for that and for this question |dw:1435096613252:dw| you can not call this adjacent (it isn't touching the angle that I asked you to look at)
for the child one? opposite sorry
yes and yes
let's talk about one problem at a time
we will come back to the child one (because you know it might get confusing )
|dw:1435096741024:dw| that one side is always the hyp no matter what angle we decide to look at
anyways opp/hyp you should think sin function
the only answers i have fot the child one is 55 degrees, 35 degrees, 51 degrees, and 39 degrees.
got*
\[\sin(53^o)=\frac{x}{10}\]
yes arctan(17/14) does give one of those answers
|dw:1435096879182:dw|
its 51 degrees i thought it was either that or 35 degrees and went with 35 oops thank u!
so for the other question do i type sin(53) in?
well you need to multiply both sides by 10 to get x by itself
and yes you can type in sin(53) but you will need to multiply that result by 10
so 7.39631095?
would it be 8.0?
that is almost kinda close to what I got I have 7.986 blah blah
which is pretty darn close to 8 we got to figure out what is going on with your calculator
what does your calc say when you enter in just sin(53)
0.739631095
hmmm...
that is really weird should be getting 0.7986355100
but the real answer that comes up on that site link u gave me is showing what u got
Yeah i dont know whats wrong with this calculator.. maybe thats why ive gotten answers wrong many times on homework
The answer is 8.0 then but i really dont know what my calc is doing
yeah the answer is 8
i have no double about that
and your mode is in deg?
just figured out your problem
I was able to duplicate your answer for sin(53)
not degrees
change the mode and you fixed your problemd
you have your mode in grads* we need degrees let's see if I can give instructions --- hmmm... you should see mod then deg (and that is what you want but looking it up)
oh you left :p
if you want to change to degrees Press shift setup(Mode) then choose 3 Deg
im here
ok i just changed my mode.
yay the answer is right on my calc now. thank you so much !

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