Théorème pythagoricien esquissé à la craie blanche sur un tableau à craie - Photo & image de stock

Pythagorean theorem sketched with white chalk on a chalk board

Pythagorean theorem sketched with white chalk on a chalk board

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

Close-up of students hand writing formula on blackboard

Female hand writing maths formulas on chalkboard

Teacher hand writing formulas on blackboard background

One plus one equals two, simple mathematics calculation on green chalkboard

Pythagorean theorem sketched with white chalk on a chalk board

A detil from a pupils homework notebook

Pythagorean theorem, also known as Pythagoras's theorem, math class in the school with teacher writing mathematical formula on white board, selective focus

Illustration of two humanoid figures, a teacher and a student in front of the blackboard doing equations

Hand underlining with chalk on school blackboard. Teacher emphasizing something important, mock up copy space

Hand underlining with chalk on school blackboard. Teacher emphasizing something important, mock up copy space

Hand underlining with chalk on school blackboard. Teacher emphasizing something important, mock up copy space