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640 phi = 1/3 phi 3.3 . t
640=3t
t = 213,3 cm
maaf klo slah
V=⅓πr²t
t=3V÷πr²=(3.640π)÷(π.3²)=1920÷9=213,3 cm
s²=r²+t²=3²+(213,3)²=9+45496,89=45505,89
s=√45505,89=213,321 cm