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Family Lines System ended in 1983.
They do not. A set of lines can also be considered as a system of linear equations. But the fact that there is such a system does not mean that the lines intersect.
A grid, or on orthogonal grid, to be more precise.
If the lines intersect, then the intersection point is the solution of the system. If the lines coincide, then there are infinite number of the solutions for the system. If the lines are parallel, there is no solution for the system.
independant
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because his uncles were ants
So you can find precise locations on the Earth's surface.
Plotters
Family Lines System was created in 1972.
Family Lines System ended in 1983.
Lines of latitude and the lines of longitude.
They do not. A set of lines can also be considered as a system of linear equations. But the fact that there is such a system does not mean that the lines intersect.
A grid, or on orthogonal grid, to be more precise.
Different thickness of lines denotes different things. Object lines are a specifice thickness (in relation to other lines on the same drawing) to visually identify 'objects'. Dimension lines are usually thinner, so as not to get confused with the lines that identify the object in question.
If the lines intersect, then the intersection point is the solution of the system. If the lines coincide, then there are infinite number of the solutions for the system. If the lines are parallel, there is no solution for the system.