Sunday

December 21, 2014

December 21, 2014

Posted by **Louis** on Sunday, September 23, 2007 at 11:07am.

14.2 = b

---- ----

sin38 sin 67

a = 46

--- ----

sin20 sin130

(10.7)^2 = (9.5)^2 + (12.4)^2 - 2(9.5)(12.4) cos <B

I just need someone to explain this to me because I just don't get it... thank you for any help

- Math -
**bobpursley**, Sunday, September 23, 2007 at 11:17amYou are dealing with the law of sines and cosines. I am not certain what you don't get. Is it the algebra?

1) b=14.2*sin67 / sin38 put these in the calculator and compute.

2) Same issue:

a= 46*sin20/sin130

3) Law of cosines:

cosB= ((10.7)^2 - (9.5)^ - (12.4)^2 )/[(9.5)(12.4)]

Then to find angle B, take the inverse cosine of that result.

If you have questions, ask.

**Answer this Question**

**Related Questions**

tigonometry - expres the following as sums and differences of sines or cosines ...

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...

Trigonometry - Does anyone have a good website that shows the proofs for these ...

Math - Calculus - The identity below is significant because it relates 3 ...

algebra - Can someone please help me do this problem? That would be great! ...

trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...

trigonometry HELP pleasE! - these must be written as a single trig expression, ...

Trigonometry - Please review and tell me if i did something wrong. Find the ...

Trigonometry - I need help with I just can't seem to get anywhere. this is as ...