Blackboard with doodles associated to celebrate Pi Day: pie cake, circle, ratio, diameter of circumference and date for this holiday in March 14. premium vector by PenWin

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vector number circle illustration day event holiday frame date symbol school letter gradient geometry outline greek postcard physics month march poster series mathematics blackboard scribble doodle chalk diameter math typography ratio chalkboard circumference commemoration perimeter pi trigonometry constant transcendental irrational hand drawn chalk drawing

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