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white chalk hand writing in mathematics formula pythagorean theorem or pythagoras`s theorem on blackboard background
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background
black
blackboard
board
calculate
calculation
chalk
chalkboard
class
college
color
education
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equation
formula
function
geometry
hand
handwriting
hypotenuse
knowledge
laboratory
lecture
math
mathematics
number
physics
power
problem
pythagoras
pythagorass
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solving
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triangle
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white
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writing