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it this the answer to number 1?

yes if i used my calculator correctly.

can you answer the other 3 please? I will give you a good answer for all

want me to write the next one or do you want to do it. just use the formula.

you do next one I will do last 2 if I can

ok here goes:
\[\frac{1}{2}\times 12 \times 13 \times sin(42)=52.19\]

ok I did 1/2*5*4*sin100 and got -5.063 is that right?

no you area must be positive.

i think maybe your calculator is in radian mode. let me check.

hmmm ok I am using the Ti-84 Plus calc and idk what i did wrong
how do I change it?

hit "mode" and you should see the option there.

http://answers.yahoo.com/question/index?qid=20090312222055AA3FPqb

I got 9.84???

yes!

sure ask away.

sweet thanks

i need to know (or rather you need to know) what angle is M? is it opposite a, b or c?

2. in triangle DEF, d = 24 m, e = 21 m, and f = 25 m. I will try this one
Angle m is B

opposite b? ok

yeah it say m Angle B=...

so in the first one you don't know the length of the side opposite angle M = 38 yes?

yes that sounds right

or you are supposed to use the law of cosines which says
\[a^2=b^2+c^2-2bc cos(A)\]

yes!

so we will have to use
\[b^2=a^2+c^2 -2ac cos(B)\]

so \[b=\sqrt{154.1}=12.4\] rounded

at least that is what my calculator told me

ok lol that makes since

of course you are not done because you have to find all the rest.

not really. especially since we have only knocked out one answer.

you still have to find A and C

oo right ok

\[sin(A) = \frac{20 sin(38)}{12.4} = .993\] i think

damn i am not getting any of your answers.

sorry....

my calc gives 44.03

but don't forget that we rounded b = 12.4. maybe if we don't round we get a more exact answer.

ok so A =43.9

no that was C
A you find by subracting: 180 - 38 - 43.9=98.1

wanna try the next one?

sryy gotta go thanks for the help tho

welcome