A point P is 12 km due north of another point Q. the bearing of a lighthouse,R, from P is 135 degress and, from Q, it is 120 degress. calculate the distance PR.
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A point is 12 km due north of another point .
The bearing of a lighthouse from is 135°, and from it is 120°.
Calculate the distance .Code:| P * 135° | * |45°* r=12 | * | * | * Q * 120° * * * q * * * * * * * * * * * * *15°* * * * R
In , we have: . , then
. . also: .side and we want side
Law of Sines: .
Therefore, we have: . km.