i want to find the area of a triangle with the given angles A=32˚ C= 77˚ a=71cm. I got the answer about 48.5sqcm but the answer says 170sqcm..How is this possible? click attached.http://bamboodock.wacom.com/doodler/0cb3063d-8c0b-4902-82c1-055993bc5aba

- anonymous

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- anonymous

you on?

- anonymous

yes i am! my computer froze

- anonymous

okay no biggie

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- anonymous

let me ask some questions here. First when you did the work did you check the signs like + - because the could cause a problem also in the first part explain this a little I am just trying to understand

- anonymous

um i think i am doing it right.

- anonymous

okay than where did 180 come from?

- anonymous

I did to know the whole problem not just answers

- anonymous

180 is the total of the 3 angles of the traignle

- anonymous

since i know A=32 and C=77 B= 71 from 180-32-77

- anonymous

did you plug for for these?

- anonymous

did you a and put in it for a

- anonymous

the formula to find an area of a triangle with 2 angles and one side given is area= a^2sinBsinC / 2sinA

- anonymous

so i did like this

##### 1 Attachment

- anonymous

am i wrong or is this book stupid...? lol

- alexwee123

im just curious
is this geometry or trig? o.0

- anonymous

its in trig.

- alexwee123

oh ok then maybe you can check this site out
http://www.regentsprep.org/Regents/math/algtrig/ATT13/areatriglesson.htm
it gives a better formula and solution :D

- anonymous

ok ok...i think u should try to change your calculator settings to degrees and not radians!

- anonymous

its in degrees...i already tried doing that...

- anonymous

what is the answer?

- anonymous

wait a seocnd...i'll put my numbers up...i got approximately 170.3...check for yourself...

- anonymous

same here..

- anonymous

i got 61.63 but the book says 170...

- anonymous

I think the second part is wrong somehow

- anonymous

|dw:1344138495546:dw|

- anonymous

yep that is what is wrong forgot to put the a b c in the problem

- anonymous

in other words sub in

- anonymous

wait how did you get 180.57.?? i cant got 188.36

- anonymous

ok...lets take even more baby steps! what did u get for sin71 x sin77?

- anonymous

cfraser should I go and let you help or stay??

- anonymous

i can help...i guess...!

- anonymous

sin77= 0.9744 sin71= 0.9455

- anonymous

im so sorry ><

- anonymous

y?

- anonymous

for making you guys have a hard time....

- anonymous

nah don't worry about it

- anonymous

thank you! so does this look okay so far?

- anonymous

haha! no problem...most of us are here to help and make ourselves feel better anyways! lol...and actually 186 is right! (i mistyped!)

- anonymous

what did u get for 2sin32?

- anonymous

ha ha typo wow get love trig on a computer ha ha

- anonymous

2sin32 = 1.0598

- anonymous

okay...so, divide those two numbers!

- anonymous

dont round them up like me! the more digits...the better!!

- anonymous

i got 177.39

- anonymous

yes

- anonymous

hmm...so...thats much closer to 170! lol

- anonymous

isnt it lose to 180....?lol

- anonymous

yeah, but who is keeping track lol

- anonymous

better than 48.5! :)

- anonymous

lol

- anonymous

HEY i got it

- anonymous

sweet! great!!

- anonymous

GREAT JOB!!

- anonymous

thanks a lottttt!!!!

- anonymous

glad to help :)

- anonymous

same feeling here!

- anonymous

cfraser007 nice job!!

- anonymous

thanks :D!

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