Question

Can someone check these and help me with both?
http://oi39.tinypic.com/2qish7r.jpg

Answer 1

So for 107 we have that
<A=26
<B=64
<C=90

Answer 2

And
BC=2
AC=4.1
AB=4.5

Answer 3

So the 90 is coming from the angle measure of the triangle,right?

Answer 4

Well it says it's a right triangle which means it's 90 degrees.

Answer 5

okay!

Answer 6

Also, For the sides.
\[\cos 26 =\frac{ x }{ 4.5 }\]
\[4.5\times \cos 26=x\]
\[2.91113695048=x\]
or
\[2.9=x\]
AC=2.9

Answer 7

Then for the other side
\[\cos64=\frac{ y }{ 4.5 }\]
\[4.5\times \cos 64=y\]
\[1.76335753693=\]
or
\[1.8=y\]
BC=1.8

Answer 8

For the next one. I know I do this but what do I need to plug in or do I have to plug something in? \[\sin^{-1} \frac{ 4 }{ 126 }\]

Answer 9

^108.

Answer 10

Well first off where did you get 126?

Answer 11

Do this.
\[\cos^{-1} (\frac{ 4 }{ 13.6 })\]
To find angle B.

Answer 12

Is there a calculator online to do this???

Answer 13

Go to google and search
4/13.6
a calculator will pop up.

Answer 14

Then what should I do with the Cos^-1

Answer 15

Do
\[\cos^{-1}(0.29411764705)\]
But that comes out as 1.27226412562 which seems a little odd...

Answer 16

@phi @amistre64

Answer 17

@kausarsalley

Answer 18

@RoseDryer I found this calculator and it gave me this answer

Answer 19

what are you trying to find??

Answer 20

108 so far

Answer 21

are you finding the length of AB on question 107??

Answer 22

are you there??

Answer 23

no 108...sorry

Answer 24

so are you finding the length AB??

Answer 25

Well the a and b are separated but yes

Answer 26

what you found for b is right.

Answer 27

okay! then what should I do for the lowercase ones??

Answer 28

don't you think the lower case ones are suppose to be for the lengths and the upper case onea are for angles you are supposed to find??

Answer 29

Yes, so the lowercase ones is 72.9 or is it the m<B

Answer 30

i am saying that isn't is supposed to look like this?:
a=4
b=13
c=13.6
and what you are left to find is m<A, m<B and m<C??

Answer 31

just asking you to be sure if it is nit like that, then okay..

Answer 32

Well see this is what I have so far.

Answer 33

the distances you find are for the lower case letters and the angles you find are for the upper case letters

Answer 34

Alright so the ones I have are correct?

Answer 35

if that is the case, then
a=4
b=13.0
c=13.6

Answer 36

Thank You Very Much!!!!! :-)

Answer 37

is that it??
are you not supposed to find m<A, m<B and m<C

Answer 38

well for these m<A,13.6 m<B,72.9 and m<C 1.8

Answer 39

hold on pls

Answer 40

isn't m<c 90 degrees??

Answer 41

Well my teacher told me that we had to find sine^-1 and multiply it by 4/126

Answer 42

that is when you are finding angles but in this case, if you say m<C is not 90degrees then you don't have a right angled triangle then

Answer 43

were you trying to type 13.6 instead of 126???

Answer 44

oh okay because I swear I saw my teacher write down 126 well okay

Answer 45

because Rose dryer told me to do cos rather than sine??? so I wasn't sure

Answer 46

she told you the angle was 90degrees at <C??

Answer 47

^^look up the previous comments

Answer 48

are you there??

Answer 49

yeah I know,so the ones you gave me for the lowercase ones are correct?

Answer 50

yes...i think that should be it

Answer 51

can you find the angles??

Answer 52

the angles m<A,13.6 m<B,72.9 and m<C 1.8

Answer 53

m<C is supposed to be 90degrees because of the right-angle symbol

Answer 54

Oh okay sorry I forgot to change that

Answer 55

but the rest are correct right

Answer 56

if m<c is 90 degrees, and you found m<B to be 72.9 degrees, then m<17.1

Answer 57

i meant m<C to be 17.1 degrees
because you know angles in a triangle add up to 180degrees...so if you have already found twp, you could find the last one....that is how i found m<c to be 17.1degrees

Answer 58

**if you have already found two

Answer 59

do you understand me??

Answer 60

Yes I do

Answer 61

and for 107 do I do the same for m<C

Answer 62

and it does not equal to ninety

Answer 63

for 107, m<C is still 90degrees because of the right-angled symbol at C

Answer 64

Okay Thanks

Answer 65

you are welcome...(:
Hope you understand everything now

Answer 66

Yes I do Thank you very much :D

Answer 67

yw!..(:

Answer 68

FYI @RoseDryer
for
4.5×cos26=x
the 26º was treated as radians, so you got
2.91113695048=x

if you use google, type in
4.5 x cos(26 deg)=
you get x= 4.04 or about 4.0

In
acos(0.29411764705)
the answer was returned in radians. If you use google, and you want degrees, type in
acos(0.29411764705) in degrees

or, if using, calculator, be sure to be in "degree mode"

Answer 69

My calculator is all messed up right now, it will only do radians. I just need to reset the whole thing.