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9420= 3,14 x r kuadrat x 30
9420= 94,2 r2
9420/94,2=r2
100=r2
10 cm=r
d= 2 x r = 20 cm
9420 cm³ = 3,14 x r² x 30 cm
9420 cm³ = 94,2 x r²
r² =9420 cm³ ; 94,2 cm²
r² = 100 cm
r = √100
= 10 cm