Authalic sphere has an area of the earth s shape-representing ellipsoid and the radius of 6,371 km. Geoid is a shape representing earth that is constructed to approximate the mean sea level. The unit used in geographical coordinates is an angular degree. Prime meridian has a value of 180 degrees and defines the International Date Line. Parallels cross with meridians at a 90 degrees angle.
Equator is a small circle.
Only one of earth s magnetic poles coincides exactly with the geographic North Pole. 15. True azimuth is characterized by the same direction along the path of the journey. Quadrilaterals bounded by two parallels have the same area at different longitudes. None of the above. All projections cause some geometric distortions to the objects that are being projected.