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January 25, 2015

January 25, 2015

Posted by **Kat** on Wednesday, January 9, 2013 at 11:58pm.

If angle A=30* and side b=4.0 km, how do I find side c?

I know that this is a 30-60-90 triangle but I don't know how to find the hypotenuse. please help!

- math HELP! -
**drwls**, Thursday, January 10, 2013 at 12:38amSince angle B is 60 degrees, and A is less (30 degrees) the law of sines says that the length of side a is less than that of side b. The length of side c is given by the lasw of sines:

c/sin 90 = c = b/sin60

c = 4.0/0.866 = 4.619 km

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