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120 = 1/3 x 3,14 x r² x 10
120 x 3 = 31,4 x r²
360 =31,4 x r²
360 /31,4= r²
11,46 = r²
√11,46 = r
3,38 = r
120 = 1/3 × 3,14 × r² × 10
120 = 31,4/3 r²
r² = 120/31,4 × 3
r² = 11,46
r = √11,46
r = 3,38 cm