スクラップブックの代わり

「人生は壮大な暇つぶしである」という信念を持った二十代後半男子のスクラップブック。
~ Thursday, January 12 ~
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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


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