(Crying)

Please help me, I'm not really good with trigo..

A pilot flew for 210 miles at 21degree and then 147 miles at 162 degree. How far was he from starting point?

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- Sep 23rd 2012, 02:48 PMAdikzHow far was the pilot from starting point?
(Crying)

Please help me, I'm not really good with trigo..

**A pilot flew for 210 miles at 21degree and then 147 miles at 162 degree. How far was he from starting point?** - Sep 23rd 2012, 03:12 PMskeeterRe: How far was the pilot from starting point?
start by making a sketch of the problem ... looks to me like a task involving the cosine law.

- Sep 23rd 2012, 03:35 PMAdikzRe: How far was the pilot from starting point?
Thanks for the diagram sir..

∠ABC = 21 + (180 - 162) = 39° Is that correct sir? - Sep 23rd 2012, 03:40 PMskeeterRe: How far was the pilot from starting point?
- Sep 23rd 2012, 03:43 PMAdikzRe: How far was the pilot from starting point?
Using the law of cosines:

This will be my new formula right?

b = √(210² + 147² - 2 * 210 * 147 * cos 39°) - Sep 23rd 2012, 05:48 PMbjhopperRe: How far was the pilot from starting point?
formula is a^2+b^2 - c^2 / 2ab = cos 39 deg Solve for c given a and b

- Sep 25th 2012, 03:08 AMskeeterRe: How far was the pilot from starting point?
- Oct 1st 2012, 05:03 PMAdikzRe: How far was the pilot from starting point?
Thanks..