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Keliling = 2 x phi x r = 2 x 22/7 x 28 = 176 cm
2.464 = 22/7 x r²
r² = 2.464 x 7/22
r² = 112 x 7
r² = 784
r = √784
r = 28 cm
K = πd
= 22/7 x 56
= 22 x 8
= 176 cm