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Posted by **Lucy** on Sunday, October 19, 2008 at 10:52am.

Thanks for any help--I stink at word problems!

- Pre-calculus -
**Reiny**, Sunday, October 19, 2008 at 10:58amSuppose you laid the triangle down in front of you.

What would you see?

Would it not be a simple triangle with sides 56 and 65, and the angle contained between those two sides of 105º ?

clearly a Cosine Law question.

x^2 = 56^2 + 65^2 - 2(56)(65)cos 105º

solve for x

let me know what you got.

- Pre-calculus -
**Lucy**, Sunday, October 19, 2008 at 11:06amx=95.5 cm

- Pre-calculus -
**Reiny**, Sunday, October 19, 2008 at 11:12amno, I got 96.15

x^2 = 56^2 + 65^2 - 2(56)(65)cos 105º

= 3136 + 4225 - 7280(-.258819)

notice the last term will become positive, I think you subtracted it instead.

- Pre-calculus -
**Lucy**, Sunday, October 19, 2008 at 11:21amx^2=3136+4225-(0.2588)

x^2=3136+4225+0.2588

x^2=7361.26

x=85.8

- Pre-calculus -

- Pre-calculus -

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