A. V. Gladkii, “On Definitions of a Length of a Circumference and an Area of a Circle”, Math. Ed., 2000, Issue 4(15),Pages <nobr>41

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Math. Ed., 2000 Issue 4(15), Pages 41–50 (Mi mo326)

Students and teachers of secondary school

On Definitions of a Length of a Circumference and an Area of a Circle

A. V. Gladkii