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Figure 4.37
4.14 MUTUALLY PERPENDICULAR PLANE
From solid geometry we know that planes mutually perpendicular if one of them passes
through a perpendicular to the other.
Through a given point A we can pass an infinity of planes perpendicular to a given plane Δ. In
space, these planes form a pencil of planes, the axis of which is a perpendicular dropped from point
A to plane Δ.
We pose the following problem: to pass a plane, perpendicular to a plane Δ given by traces,
through a given line l (Fig. 4.38).
Figure 4.38
Other cases of this problem are presented in Fig. 4.39, 4.40, 4.41.
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