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Definition of perpendicular planes.

Let the st. line a be the common section of the two planes α and β.Let the plane γ be perpendicular to a and intersects the planes α and β at the perpendicular st. lines m and n, i.e. the cross-section of γ and α is m, the cross-section of γ and β is n and m is perpendicular to n. The planes α and β are called perpendicular planes.

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