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Teorema delle tre perpendicolari

Author:
Tomasi Alessandra
Topic:
Straight Lines, Planes, Solids or 3D Shapes
Se dal piede H di una retta s (PH) perpendicolare ad un piano si conduce la perpendicolare HK ad una retta r di , allora la r è perpendicolare al piano () delle rette s e HK.
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