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1.5 QUADRANTS OF SPACE

System of projection planes  1 and  2 divides space into four quadrants (Fig. 1.10). They
differ with signs on co-ordinates of points (Table 1.1).

Table1.1 – Signs on co-ordinates of points into different quadrants
coordinates
quadrants
Х Y Z
І + + +
ІІ + - +
ІІІ + - -
ІV + + -

We use the 1rst angle projection (1rst quadrant), as usual in most European countries.

Figure 1.10

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