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Table is "Te-buru" in Japanese and Te-buru is "テーブル"
2 H D D are connected to a single PC
d = r/2 = 1.3656 V = pi x (d/2)2 x h h = d/2 and V = 2 (d/2)2 times h = 2/pi 2/pi = 0.636619772
d/dh(h^-1) = -1(h^-2) = -(h^-2)
3D