14th
3
14
academic
arithmetic
background
blackboard
chalk
chalkboard
circle
circumference
classroom
college
constant
date
day
diameter
education
exam
explain
female
hand
homework
international
irrational
knowledge
learn
lecturer
lesson
march
math
mathematical
mathematics
number
people
person
pi
profession
ratio
school
science
student
study
subject
teacher
tutor
university
woman
world
writing
定額
Female teacher writing number Pi on blackboard in classroomの素材 [FY310189789701]
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