A = 2\pi imes 3 imes (3 + 10) = 2\pi imes 3 imes 13 = 78\pi \quad ext{å¹³æ–¹ãƒ¡ãƒ¼ãƒˆãƒ«}

Sun, 03 May 2026 10:00:36 +0000

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