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sederhanain 1/4 (22. 2). 14 =
lagiii 11.14 = 154cm2 >>>>>> 1/4 pi d kuadrat (14, tinggal ganti 28, 56, 112)
keliling = 22/7 . 14 (14 tinggal ganti 28, 56,112)
sederhanain 22. 2 = 44cm