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Contoh 2<br />
Tentukan jari-jari dan diameter lingkaran yang<br />
mempunyai keliling 154 cm. Gunakan π = 22/7!<br />
Penyelesaian:<br />
Keliling K = 2 π r = 2 x 22/7 x r = 154 cm<br />
Maka r = (154 x 7/22) : 2 = 24,5 cm
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