Math geometry formulas on background.
Schlüsselwörter
geometry,
chalk,
board,
mathematic,
write,
equation,
blackboard,
background,
science,
lesson,
education,
school,
formula,
college,
theory,
mathematic,
classroom,
class,
signs,
physics,
algebra,
calculate,
blackboard,
complex,
number,
problem,
solution,
study,
symbol,
teacher,
white,
exam,
learn,
line,
instructing,
scribble,
figure,
proof,
grunge,
abstract,
calculus,
minus,
old,
scratch,
slate,
vintage,
trig,
green,
drawing
Deutsch
