In a picture, the objects decrease in size as they recede towards the

a.

vanishing point

c.

orthogonal lines

b.

picture plane

d.

vantage point

it would be the first option

this is a good question! i'll do some research and come back when i have the answer!

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.