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# Problems in 2 dimensions

AC=10km

CB=7.23km

角ACB = N62度E

角CAB = S44度E

角ABC = 180-44-62= 72

find AB

AB^2 =7.23^2+10^2 -2(7.23)(10)cos 62

=16.3436

AB= 開方16.3436

=4.0427

答案是 6.38

why?

Update:

sorry ,

角ABC = 180-44-62= 74

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