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besar sudut / 360 derajat * keliling lingkaran
Rumus keliling lingkaran:
K = phi * d
dengan
d = 2 * jari-jari
Panjang busur AB
<=> <AOB / 360 * 3,14 * 4 cm
<=> 30 / 360 * 3,14 * 4 cm
<=> 1,05 cm
Panjang busur CD
<=> <COD / 360 * 3,14 * 4 cm
<=> 75 / 360 * 3,14 * 4 cm
<=> 2,62 cm