Objects creation and modification
 
Drawing geometric objects  
Drawing lines
 
 Overview 
 
 Operations 
 
 Commands 
 

How to draw a (straight) line

How to draw a (straight) line tangent to two curves

How to draw a (straight) line tangent to a curve and perpendicular to an other one

How to draw a (straight) line perpendicular to a curve and tangent to an other one

How to draw a (straight) line perpendicular to two curves

How to draw a semi-infinite line

How to create a construction line