I usually trace it when drawing a motorbike.
apple iphone
trace from a coloring book or online drawing
As a trace metal, arsenic is found in apple seed.
To outline something means that you 'trace' it - you move a pencil/pen around each of the triangle's lines. You end up drawing a triangle on top of the triangle you were outlining.
to sketch picture of a car or any 3D designs
You take a photo and trace it to look exactly like the photo it is very common in books
Obviously there isa type of ruler thingy just trace it simple!
Anything that you didn't trace or use tools like rulers, french curves... is technically considered "freehand." Freehand is distinguished from Technical Drawing.
All drawing is a form of projection in itself. If you mean how do you project orthographic shapes to trace then the best way would be to place a light 180 degrees behind the object you wanted to draw. This would cast a silhouette (which is essentially what an orthographic drawing is) that you can trace.
A pantograph can be used to trace a drawing by placing a point on the existing drawing and using another point, side by side, on the other paper drawing out the particular drawing. A pantograph looks like a is two rulers in the shape of a "V" that are connected by 4 points. One "V" is inverted.
Corel Trace is a feature of CorelDRAW, which is one of the most popular drawing programs in use today. Corel Trace usually produces really good results, but it is based on the quality of the original artwork.