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π . r . s = 204,1 cm^2
3,14 . r . 13 cm = 204,1 cm^2
40,82 . r = 204,1 cm^2
r = 204,1/40,82 cm
r = 5 cm
volume = 1/3 π . r . s
V = 1/3 . 3,14 . 5 . 13
= 65/3 . 3,14
= 204,1/3
=68,0333...
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