Difference between First and third angle
Anónimo
In first angle projection, the object is imagined to be in the first quadrant (positive quadrant) of a right-handed coordinate system. The front view is drawn above and the top view is drawn below the object. In third angle projection, the object is imagined to be in the third quadrant (negative quadrant) of a right-handed coordinate system. The front view is drawn below and the top view is drawn above the object.