diketahui: sudut aob=125 derajat ,ob=8 cm ditanya:p busur ab

Panjang busur AB
= 125°/360° x keliling lingkaran
= 125°/360° x 2πr
= 125°/360° x 2 x 3,14 x 8 cm
= 125°/360° x 50,24 cm
= 17,44 cm