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berputar 25 kali
jarak y ditempuh = 22 m = 2200 cm
maka :
K roda = 2.200/25 = 88 cm
K = 2 x 22/7 x r
88 = 44/7 x r
r = 28 cm
maka :
L = 22/7 x 28²
= 2.464 cm²