First Angle and Third Angle Projection

Standard 3 Views are in either third angle or first angle projection. In third angle projection, the default front view from the part or assembly is displayed at the lower left, and the other two views are the top and right views. In first angle projection, the front view is displayed at the upper left and the other two views are the top and left views.
3rd angle projection drw_projection_3rd_angle.gif
1st angle projection drw_projection_1st_angle.gif