Equations on blackboard.
Equations and formulas written in chalk on blackboard. Concept of education and science.
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Keywords:
backgroundblackboardboardcalculatechalkchalkboardconceptdiagramdirtydrawingeducationequationsexamformulagraphichandwritingillustrationknowledgelearnlecturelessonlinemathmathematicalmathematicsnumberoldphysicsschoolsciencescratchsignsketchsolutionstudystudyingsymbolteachtexturetheoryusedwrite
Username: Borysshevchuk
Editorial: No
Width: 4500 pixels
Height: 3500 pixels
Downloads: 8
Image ID: 24233217