 | Jeremiah Day - Geometry - 1839 - 434 pages
...any two contiguous sides make with each other, may be known by the following rules. 1. If one course is North and the other South, one East and the other West ; subtract the less from the greater. 2. If one is North and the other South, but both East or West ; add them together.... | |
 | Jeremiah Day - Geometry - 1851 - 418 pages
...any two contiguous sides make with each other, may be known by the following rules. 1. If one course is North and the other South, one East and the other West ; subtract the less from the greater. 2. If one is North and the other South, but both East or West ; add them together.... | |
 | William Smyth - Navigation - 1855 - 234 pages
...drawing meridian lines though the corners. The angles may be found by the following rules. 1°. If the bearing of one of the sides is north and the other...other west, subtract the less course from the greater. 2°. If one is north and the other south, and both east or west, add both courses together. 3°. If... | |
 | Elias Loomis - Trigonometry - 1855 - 192 pages
...If one is north and the other south, but both east or west, subtract their sum from 180°. 4. If one is north and the other south, one east and the other west, subtract their difference from 180°. Thus the angle CAB is equal to NAB-NAC. The angle CAD is equal to NAC... | |
 | Elias Loomis - Logarithms - 1859 - 372 pages
...If one is north and the other south, but both east or west, subtract their sum from 180°. 4. If one is north and the other south, one east and the other west, subtract their difference from 180°. Thus the angle CAB is equal to NAB-NAC. The angle CAD is equal to NAG... | |
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West ; add them together. 3. If both are North or South, but one East and the other West; subtract their sum from 180 degrees. 4. If both are North or South, and both East or West ; add together 90 degrees... 
