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How is the angle of magnetic declination measured?
You need to determine the geographic north, for example by observing sunrise and sunset; by observing the stars; or by using a compass that reacts to Earth's rotation (a gyrocompass). Then you observe where the needle of a magnetic compass points. Finally, you measure the angular difference between the two.
How do you find the angle between two points?
You have to convert them to Polar Points or the Azimuth points and use the angle difference.
The set of all points outside an angle?
exterior of the angle
What does it mean by name an angle three ways?
For example, you might name an angle as "ABC", where "B" is the vertex, and "A" and "C" are points lying on the sides of the angle. If there are additional points on the same sides, you can substitute those points instead.
How many points must be selected to measure an angle?
To measure an angle you must take all the points in between the two. Therefor it could be anywhere from 2 to 100 points.
