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15 = 1/3 × K lingkaran
K lingkaran = 15 : 1/3
K lingkaran = 15 × 3/1
K lingkaran = 45 cm
Jawaban: B
panjang busur 120 derajat
ditanya:
k:?
jawab:
k=panjang seluruh busur di lingkaran
360:120=3×15=45