Two ships A and B sail simultaneously from the same place. vessel A on course 300at 15 knots and B on course N 45°E at 10 knots. After 1 hour and 30 min, how far is vessel A to vessel B?
As theorem of cosine
c2=a2+b2−2abcosαc^2=a^2+b^2-2abcos \alphac2=a2+b2−2abcosα
a=15x1.5=22.5 knocks
b=10x1.5=15 knocks
c=22.52+152−2x22.5x15xcos(45°)=506.25+225−477.3=253.95=15.9knokcsc=\sqrt{22.5^2+15^2-2x22.5x15xcos (45°)}=\sqrt{506.25+225-477.3}=\sqrt{253.95}=15.9 knokcsc=22.52+152−2x22.5x15xcos(45°)=506.25+225−477.3=253.95=15.9knokcs
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