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200π = 1/3 . π . r² . 12
r² = 50
r = √50 = 5√2
Jawaban: 5√2 cm
200 = 1/3 (jari)^2 12
200 = (jari)^2 4
dicoret
200 = (jari)^2 4
(jari)^2 = 50
jari-jari = 5√2
^ artinya pangkat jari maksudnya jari-jari