bagaimana cara mengetahui panjang busur

p.busur=[a°/360°]×K.lingkaran
=[105°/360°]×2.phi.r
=7/24×(2.3,14.12)
=7/24×75,36
=21,98
=22cm

Panjang busur AB
= 105°/360° x keliling lingkaran
= 105°/360° x 2πr
= 105°/360° x (2)(3,14)(12 cm)
= 21,98 cm
= 22 cm