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keliling = phi × d = 22/7 × 14 = 44
luas = phi × r^2
= 22/7 × 7^2
= 22/7 × 49
= 154
b. K = πd = 22/7 · 14 = 44 cm
c. L = πr^2 = 22/7 · 7 · 7 = 154 cm2