Finding angles!

- anonymous

Finding angles!

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- anonymous

##### 1 Attachment

- Nnesha

same question like we did before

- hartnn

a and c are given
concentrate on Angle A!
we have opposite side and hypotenuse!
which trigonometric ratio will you use?

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## More answers

- anonymous

Nnesha it was wrong though :) by the way I found out that he doesn't want the degree symbol

- Nnesha

do you mean 28 and 62 was wrong ??

- anonymous

it said undefined when I entered it

- anonymous

hartnn do we set up a proportion only using 90?

- Nnesha

what ?? o.O

- Nnesha

alright i'll check it out let
i'll try t ofind what was wrong .... hmmm

- hartnn

setup a trignometric proportion,
what will be sin A?

- shaik0124

length b is 4

- hartnn

and yes,
if one of the angles in a triangle is 90, only then we can use the definitions of trigonometric ratios

- anonymous

sin A=a/5

- hartnn

a is given to be 3!

- anonymous

sinA=3/5 :)

- hartnn

so you can find the angle A now?

- shaik0124

for length b apply pythagoras theorem

- anonymous

hartnn, if i'm not mistaken wouldn't you need to take the inverse of sin-1(3/5)?

- hartnn

yes thats correct

- anonymous

I got 36.8, but since they want exact measures that would be 37 degrees

- shaik0124

a^2+b^2=c^2
32+b2=52
9+b2=25
b2=25-9
b2=16
b=4

- hartnn

its weird that they need the measure of angles without decimals.
yes, go with 37

- hartnn

they want "EXACT" measures and also not in decimals :P lol

- anonymous

XD I don't know I don't write these problems :D for sin(b), the proportion would equal sin-1(4/5)

- hartnn

one shortcut way to find B is to use the fact that sum of all angles in a triangle is 180 :)

- Nnesha

that's exactly how we solved first question
so 28 was the correct answer

- anonymous

hartnn I wasn't sure if that would be accurate because we rounded lol

- shaik0124

:) 90+A+B=180

- Nnesha

28+62+90 =180 \(\huge\color{green}{\checkmark}\)

- anonymous

but for sin(b) I got 53 degrees

- hartnn

so probably we can expect that 37 here will be given wrong :P

- hartnn

yes, B = 53 if rounded

- anonymous

it mentions that it's wrong :/

##### 1 Attachment

- Nnesha

ouch again!

- shaik0124

HAha enjoy sana

- anonymous

Nnesha yea :/ it's really annoying

- hartnn

try 36.86
if that doesn't work,
try \(\arcsin(3/5)\)
if that doesn't work, not sure what will :P

- shaik0124

atleast the answer i gave length b =4 is correct :)

- Ac3

stop it wants the exact value

- Ac3

decimals will not work

- Ac3

I don't see how it wants you to get the exact angle if it's not even on the unit circle

- hartnn

did
\(\arcsin(3/5) \)
work ?

- Nnesha

whats ur instructor sayz?
did he replid ?

- anonymous

hartnn Will try arcsin 3/5, but I have one last attempt before I get a new problem

- anonymous

Nnesha not yet but it mentioned how it doesn't want the degree symbol

- hartnn

don't go for 36.86
they specifically mentioned no decimals...

- Ac3

if it doesn't want the degree symbol it probably wants it in that form arcsin(3/5)

- anonymous

and for b? arcsin(4/5)?

- Nnesha

right

- Nnesha

B*
b=4

- anonymous

guyssss it's correct :D thank you a lot all of you

- anonymous

they just wanted the arcsin

- hartnn

yaaaaay! :D

- Ac3

sometimes it's just a matter of following the directions

- anonymous

Ac3 sometimes the directions aren't so clear :D

- Ac3

Well it was in bold.

- Ac3

lol

- anonymous

Ac3 XD anyways

- Ac3

lol if you need any help i'll be online for a bit.

- hartnn

move on to next problem!

- anonymous

hartnn will do :) thanks again

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