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2010-03-21T14:58:06+01:00
V = 4/3πR³

R = 30cm:2
R = 15cm
V = 4/3π*15cm*15cm*15cm = 4/3π*3375 cm³ = 4500π cm³

r = 15cm-2cm
r = 13cm
V = 4/3π*13cm*13cm*13cm = 4/3π*2197 cm² = 8788/3π cm² = 2929⅓ cm²

2929⅓:4500 ≈ 0,65
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