blackboard
cathetus
chalk
chalkboard
chalkboard background
class
classroom
draft
draw
drawing
education
elementary school
employees
exercise
explain
explaining
female
figure
geometry
girl
hypotenuse
institute
knowledge
learn
learning
leg
lesson
mathematics
people
person
portrait
primary
problem
professional
right angle
ruler
school
school building
science
student
study
studying
task
teacher
teaching
triangular
university
woman
workplace
workspace
定額
school teacher young woman in the class at the blackboard draws a triangle with a ruler. portrait. close upの素材 [FY310172049889]
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