angle
blackboard
board
chalk
chalkboard
class
education
equality
equation
famous
formula
geometric
geometry
green
illustration
learn
lesson
math
mathematician
mathematics
painted
pattern
pythagor
pythagoras
pythagorean
research
school
science
scientific
shape
sketch
study
studying
teach
theorem
triangle
university
write
定額
Pythagoras formula write on blackboard with chalkの素材 [FY31027498373]
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