Perpendicularity in orthographic projections system

Introduction to perpendicularity in a dihedral system. Requirements for lines and planes to be perpendicular to each other. All the theory explained with 3D diagrams. This YouTube channel is dedicated to teaching people how to improve their technical drawing skills. It focuses on drawing figures from the geometric plane to descriptive geometry and also different systems of technical drawing representation. If you subscribe, click, like or leave a comment you will be helping us to grow our channel and help more people with their technical drawing skills. Thank you in advance. Dubbed by Frank Shaw. Music by Antonio Fernández Ruiz. http://antoniofernandez.es/ #Geometry #HowtoDraw