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Kelas : 8 SMP
Materi : Panjang busur lingkaran
∠AB Busur CD
____ = ________
∠CD Busur AB
80° 120
___ = ____
150° x
8 120
__ = ____
15 x
8x = 120 × 15
8x = 1800
x = 1800 / 8
x = 225 cm
Jadi, Panjang busur AB adalah 225 cm