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62,8=2×3,14×r
62,8=6.28r
r=62,8/6.28
r=10
V=1/3×π×R²×t
=1/3×3,14×10²×15
=1570 cm³
smgga membantu
62,8 cm = 3,14d
d = 62,8 cm/3,14
d = 20 cm
r = d/2 = 20/2 = 10 cm
V = 1/3πr^2t
V = 1/3 x 3,14 x 10 cm x 10 cm x 15 cm
V = 1570 cm^3