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Verified answer
D1 = 10, d2 = 5K 1/2 lingkaran besar = πd1
= 3,14 x 10 = 31,4
K 1/2 lingkaran kecil = πd2
= 3,14 x 5 = 15,7
K total = 31,4 + 15,7 = 47,1
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