Question

Solve each problem. See Examples 1 and 2. Distance Traveled by a Ship A ship travels 55 km on a bearing of 27° and then travels on a bearing of 117° for 140 km. Find the distance from the starting point to the ending point.

Accepted Answer

Draw a diagram representing the ship's path: start at point O, travel 55 km on a bearing of 27°, then from that point travel 140 km on a bearing of 117° to point P. This will help visualize the problem and identify the triangle formed by the starting point, the first stop, and the final position. Convert the bearings into angles relative to a common reference, such as the horizontal axis (east direction). The first leg is at 27° from north, so measure accordingly. The second leg is at 117°, so find the angle between the two legs by calculating the difference between their bearings. Use the Law of Cosines to find the distance from the starting point to the ending point. Label the sides of the triangle: let side a be the distance traveled on the first leg (55 km), side b be the distance on the second leg (140 km), and side c be the unknown distance from start to end. The included angle between sides a and b is the difference between the two bearings. Write the Law of Cosines formula: $$c^2$$ = $$a^2$$ + $$b^2 - 2ab$$ \cos(	heta)$$, where $$	heta$$ is the angle between the two legs. Substitute the known values for a, b, and $$	heta$$ into the formula. Solve for c$ by taking the square root of both sides: c$$ = \sqrt{$$a^2$$ + $$b^2 - 2ab$$ \cos(	heta)}$$. This will give the distance from the starting point to the ending point.

Solve each problem. See Examples 1 and 2. Distance Traveled by a Ship A ship travels 55 km on a bearing of 27° and then travels on a bearing of 117° for 140 km. Find the distance from the starting point to the ending point.

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Concetti chiave

Bearing and Direction in Navigation

Vector Addition and Resultant Displacement

Law of Cosines