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maaf jika salah
K 1/2 lingkaran = 1/2 × 2 × π × r
K 1/2 lingkaran = 1/2 × 2 × 22/7 × 7
K 1/2 lingkaran = 22
total keliling keseluruhan
17 + 7 + 7 + 30 + 22 = 83