Posted by **Tareena-- check my answer please** on Saturday, May 24, 2008 at 4:39pm.

Two Planes leave an airport at the same time, one flying 300km/h and the other at 420km/h

The angle between their flight paths is 75 degrees after three hours, how fart apart are they?

- Math -
**drwls**, Saturday, May 24, 2008 at 5:12pm
I don't see your answer to check.

The law of cosines would work well on this problem. You know two sides (900 and 1260 km) and the included angle (75 deg) of a triangle.

- Math -
**Tareena-- check my answer please**, Saturday, May 24, 2008 at 5:29pm
so it would be c^2=a^2+b^2-2ab cos C

900^2+1260^2-2(900)(1260)(cos75)

c^2=33542.9

c=183.14km

is it right?

- Math -
**Tareena-- drwls check my answer please**, Saturday, May 24, 2008 at 5:33pm
thanks

- Math -
**drwls**, Sunday, May 25, 2008 at 1:08am
No. It isn't right. See my answer to your later post.

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