Posted by **Rose** on Sunday, April 7, 2013 at 8:56am.

A plane leaves hamilton and flies due east 75 km at the same time a second plane flies in a direction of 40degress southeast for 120 km how far apart are the planes when they reach their destination.

I say the calculation is 75^2+120^2-2(75)(120)cos40

the book says to use cos 45 is this a typo or am I missing something???

- math -
**Reiny**, Sunday, April 7, 2013 at 10:52am
I agree with you,

don't see how the angle of 45° can enter the picture.

I can see confusion about their "direction of 40° southeast"

- it could mean E 40° S, or

- it could mean S 40° E to some people.

but even with those interpretations the other angle would be 50°

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