Blue Boat
A blue boat and a red boat.. trig problem?
A blue boat and a red boat are on the same side of a lake and are 18 miles apart. The blue boat is 30 miles from a lighthouse on the opposite side of the lake. The angle formed by the boats and the lighthouse, and whose vertex is at the
blue boat, measures 120ยบ. Find the distance from the red boat to the lighthouse. Diagram: http://hodagenealogy.com/images/diagram.jpg
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use cosine rule c
c^2=30^+18^2-2*30*18cos120
c=42
The little blue boat
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