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t=15 cm
dit r...?
v=phi x r2 xt
4710=3,14 x r2 x 15
4710=47,1 x r2
4710/47,1=r2
100=r2
akar 100=r
10 cm=r
4710 = 47,1 r²
r² = 4710/47,1
r² = 100
r = √100 = 10 cm