How do I solve this?

- -Welp-

How do I solve this?

- jamiebookeater

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- -Welp-

|dw:1438527061044:dw| "find the area of the triangle"

- Rushwr

is that all ? No anyother angles given >

- -Welp-

That's all they gave me to work with

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## More answers

- Rushwr

have they atleast mentioned about the left over angles being same or something?

- -Welp-

|dw:1438527348097:dw| I got it backwards

- -Welp-

*Sorry, I had it backwards

- Rushwr

Soo do u want to know the whole procedure or just how to take the angles. !

- -Welp-

The whole procedure please

- anonymous

You use cosine rule for this right?

- Rushwr

That's what I was thinking too ! NOt sure though ! Still thinking ! WOuld you mind helping us @paki

- anonymous

\[a^2=b^2+c^2-2bc \cos A\]

- anonymous

\[a=\sqrt{12^2+8^2-2(12(8)\cos 81}\]

- anonymous

lets see what you get

- -Welp-

I got 13.34033668 that doesn't seem right

- anonymous

you can verify it with sine rule now that you have 3 sides

- amistre64

how would you usually figure out the are of a triangle?

- amistre64

|dw:1438530093183:dw|

- amistre64

how would we determine the height? do we know any trig functions that we could employ?

- triciaal

another approach
after using the cosine rule to get the 3rd side use Hero's formula to find the area knowing the 3 sides

- triciaal

|dw:1438531174056:dw|

- -Welp-

"you can verify it with sine rule now that you have 3 sides"
Formula for sine rule?
"how would we determine the height? do we know any trig functions that we could employ?" I don't know
"another approach
after using the cosine rule to get the 3rd side use Hero's formula to find the area knowing the 3 sides "
I don't know what I did wrong but I got 177

- zepdrix

Formula for Sine Rule:\[\large\rm \frac{a}{\sin A}=\frac{b}{\sin B}\]|dw:1438535217539:dw|

- zepdrix

Ya I like that Law of Cosines approach :o

- -Welp-

=47.4
^Is that correct?

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