the above piece is a lithograph by m. c. escher. how has escher used the concept of space effectively

In the mirrored ball, the objects are varying sizes, which allows certain objects or subjects (ex: man) to appear closer and others farther away (window), creating depth and form. The artist also made some objects curved (ex: bookshelf and ceiling) and receding, in order to show the curvilinear lines of sphere of the mirror. The hand holding the ball, with its two fingers in the forefront, and its others behind, add to the 3-dimensional appearance.

Explanation:

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.