There are two types of intaglio printing etching and engraving. which is the primary difference between the two

The key difference of etching from engraving, is the use of acid to actually remove the metal, rather than to cut into the surface with a tool.

coordinates of r(b,c)

slope of nm is 0.

step-by-step explanation:

the midpoint of the line joining the points (x₁,y₁) and (x₂,y₂) is given by

the midpoint of the line segment nk is given by

∴r(b,c)

the slope of the line joining the points (x₁,y₁) and (x₂,y₂) is given by

slope of rs is

hence

coordinates of r(b,c)

and slope of nm is 0.