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January 14 2012

m-akasya: jesuisunechatte: 円の面積 何故あの式なのか、これ見せたら子供に理解させ易そうだ

m-akasya:

jesuisunechatte:

円の面積

何故あの式なのか、これ見せたら子供に理解させ易そうだ

(via plasticdreams)

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    これならわかりやすい。
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