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<AOB=120°
∦=3,14
OA=20 cm
p. busur AB= <AOB/360°×2∦r
p.busur AB=120°/360×2∦(20)
p.busur AB=120°/360°×40∦
p.busur AB=120°/360°×40×3,14
p.busur AB=120°/360°×125,6
p.busur AB=1°/3°×125,6
p.busur AB=41,866