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t=30 cm
k=66 cm
Dit: V=?
Jwb:
k=2πr
66=2.22/7.r
r=66/(44/7)
r=66.7/44
r=10,5
V=1/3 L t
=1/3 πr^2 .t
=1/3. 22/7.(10,5)^2. 30
=22/21. 110,25. 30
=3465 cm^3