sectio abπ、center πr2 之 volumen ヲ求メヨ。 T.theodor 2023.2.18.
σφαῖρα 直径 R、height 2r。 T.theodor 2023.2.18.
σφαῖρα 之 直径 R→0 デ 2-circle、2-dimention ニス。 T.theodor 2023.2.18.
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