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Perpendicular planes

Lecture






  Perpendicular planes

Two intersecting planes are called perpendicular , if the third plane, perpendicular to the line of intersection of these planes, intersects them along perpendicular lines.
The plane α is perpendicular to the plane β. They intersect in a straight line with. The plane γ is perpendicular to and intersects the planes α and β along straight lines a and b, respectively.

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Stereometry

Terms: Stereometry