Pythagorean theorem on chalkboard
Palabras clave
teacher,
mathematic,
blackboard,
equation,
theorem,
angle,
geometry,
rectangular,
triangle,
education,
formula,
homework,
blackboard,
chalk,
thinking,
mathematic,
arithmetic,
logic,
writing,
teaching,
calculation,
decision,
school,
statistic,
research,
selection,
answer,
hand,
business,
solution,
closeup,
finger,
thought,
conclusion