N. S. Astapov, “Theorem on a Quadrangle”, Math. Ed., 2000, Issue 2(13),Pages <nobr>22

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JOURNALS // Mathematical Education // Archive

Math. Ed., 2000 Issue 2(13), Pages 22–28 (Mi mo259)

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Students and teachers of secondary school

Theorem on a Quadrangle

N. S. Astapov