Descriptive Geometry

Manipulating (rotating) picture planes(surfaces) in order to identify;

True size
True Shape
True Length
True Angle
Intersection points
Distances

If a line is paralel to a fold line in 1 view then it is true lentgh in the next view.

Point View
To find the point view you must First,
Find a true length ,Create a fold line perpendicular to the TL line Then add a point.

True size surface
you must first fund TL of a line then create a perpendicular folde line to create the edge view,next create a fold line parallel to the edge view.

Addaline, allows us to find true length in a simpler, and quicker way by skiping a whole view.