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Keliling = TTd
TT = 3,14
= 3,14 × 25 = 78,5 cm
MAAF KALO SALAH
phi = 3,14
k lingkaran
= 2 × phi × r
= 2 × 3,14 × 12,5 cm
= 6,28 × 12,5 cm
= 78,5 cm^2
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