The most influential figure in the study of congnitive development

Jean Piaget

Explanation:

Jean Piaget was a Swiss psychologist who did influential work in the field of cognitive psychology and child development.

Piaget’s famous theory of cognitive development explains the phases and nature of human development during the formation years from 0 to 11. It explains how children acquire knowledge, how they perceive the world, and how they construct and use intelligence during the development.

The theory poses four stages:

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.

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