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January 30, 2015

January 30, 2015

Posted by **Dee** on Sunday, August 21, 2011 at 2:24pm.

my answer was 13.856 km but not confident how I found the angle oshawa to begin with. I used Cos Oshawa = a/h = 8/16, cos-1 0.5=60 degrees.

Please confirm if done correctly...many thanks.

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**Damon**, Sunday, August 21, 2011 at 2:44pmangle AOU = 45 degrees

ao = 8

ou = 16

law of cosines

au^2 = ao^2 + ou^2 - 2*ao*ou*cos 45

au^2 = 64 + 256 - 2*8*16 * .707

au^2 = 139

au = 11.8

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**Dee**, Sunday, August 21, 2011 at 3:14pmHi - How did you get 45 degrees? Think that's the part I'm lost with.

- math -
**Damon**, Sunday, August 21, 2011 at 4:16pmThe angle between west and northwest is 45 degrees, halfway from west to north

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**Alan**, Sunday, August 21, 2011 at 4:51pmYes but why is it 45 degrees? I'm dividing 8 into 16 = .5 then cos-1 .5 = 60. Nothing I do is giving me 45 degrees. Hope you get notified when a thread is updated, I'm inclined to repost this incase.

Thanks again for your great answering.

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**Damon**, Sunday, August 21, 2011 at 5:40pmLabel and sketch the triangle as I did. You will see that the angle between ao and ou is 45 degrees

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