Jika luas juring OBC=60cm²,luas juring OAC adalah..?

sudut OBC = 120°
luas juring OBC = 60 cm²

[tex] \frac{120}{360} = \frac{60}{l.lingkaran} \\ \frac{1}{3} = \frac{60}{l.lingkaran} \\ l.linkaran = 60 \times 3 \\ l.lingkaran = 180 {cm}^{2} [/tex]

sudut OAC= 152°
luas lingkaran = 180cm²

luas juring OAC
[tex] \frac{152}{360} = \frac{l.juring}{180} \\ \frac{152}{2} = \frac{l.juring}{1} \\ 2l.juring = 152 \\ l.juring = \frac{152}{2} = 76 {cm}^{2} [/tex]

semoga membantu