Un insegnante scrive l'equazione del teorema pitagorico su una lavagna nera mentre insegna a un gruppo di studenti in una classe - Foto e immagini stock

Right triangle with pythagorean formula on a blackboard

The world map on a whiteboard

A teacher writes the Pythagorean theorem equation on a black chalkboard while teaching a group of students in a classroom

Studying mathematics in Kambsdal College

Pythagorean theorem sketched with white chalk on a chalk board

A teacher fills in a checkbox within in a series of symbols while teaching a math equation to a group of students

A teacher writes the theory of relativity Einstein equation on a black chalkboard while teaching a group of students in a classroom

A teacher writes the theory of relativity Einstein equation on a black chalkboard while teaching a group of students in a classroom

A teacher explains to students the principles of a normal distribution in the area of probability distribution.

A teacher explains to students Newton's law of gravity diagram, a theoretical physics equation that describes the behavior force and mass

A teacher explains to students the Feynman diagram, a theoretical physics equation that describes the behavior and interaction of subatomic particles

Wads of crumpled up paper scattered in and around a trashcan shows the frustration of an office worker. Image can be easily cropped and used as a vertical depending on buyer needs.

Wads of crumpled up paper scattered in and around a trashcan shows the frustration of an office worker. Image can be easily cropped and used as a vertical depending on buyer needs.