Chalkboard drawing with pi symbol over a circle and a long numeric series to commemorate Pi Day celebration in the school in the 14th March. premium vector by PenWin

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

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