The Pythagorean theorem on a blackboard
Palabras clave
blackboard,
blank,
chalk,
education,
learning,
wood,
asian,
black,
board,
blackboard,
class,
classroom,
concept,
difficult,
ethnic,
idea,
mathematic,
notice board,
paint,
problem,
pythagoras,
representation,
school,
schooling,
texture,
theorem,
triangle,
visual,
writing