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8.640 cm³ = x x
8.640 cm³ = ³
= ³
64 = ³
4=
Lp= 2πr (r+t)
Lp= 2 ( (20 x 12) + (12 x 36) + (36 x 20) )
Lp= 2 (240 + 432 + 720)
Lp= 2 (1.392)
Lp= 2.784