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# Applications of Trigonometry to Navigation and Surveying PowerPoint PPT Presentation

Applications of Trigonometry to Navigation and Surveying. Section 9-5 (day 2). Terminology:. Nautical mile : Unit of linear measure used in navigation About 15% longer than one mile Knot : Unit of speed used by ships and planes 1 knot = I nautical mile per hour 1 knot = 1.15077854 mph.

Applications of Trigonometry to Navigation and Surveying

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## Applications of Trigonometry to Navigation and Surveying

Section 9-5

(day 2)

### Terminology:

• Nautical mile:

• Unit of linear measure used in navigation

• About 15% longer than one mile

• Knot:

• Unit of speed used by ships and planes

• 1 knot = I nautical mile per hour

• 1 knot = 1.15077854 mph

### Review:

• Law of Cosines: (given SSS, SAS)

a2 = b2 + c2 – 2bc cos A

• Law of Sines: (given ASA, SAA, SSA)

• SAS area formula:

### example 1:

A ship proceeds on a course of 110 for two hours at a speed of 20 knots, then changes course to 220 for two more hours. How far is the ship from its starting point?

### example 2:

A ship proceeds on a course of 300° for two hours at a speed of 15 knots, then changes course to 230°, continuing at 15 knots for three more hours. At that time, how far is the ship from its starting point?

### example 3:

Tower T is 8 km northeast of village V. City C is 4 km from T on a bearing of 150° from T. What is the bearing and distance of C from V?

### example 4:

A plane flies on a course of 100° at a speed of 1,000 km/hr.

How far east of its starting point is it after 3 hours?

### example 5:

Often a plot of land is taxed according to its area. Sketch the plot of land described, then find its area.

From a granite post:

• then along a bearing of S32°E for 260 feet,

• then along a bearing of S68°W for 385 feet,

• finally along a line back to the granite post.

### Homework:

Page 362 (w) #5 – 7 all

9 – 15 odd

(show all diagrams and work)