Jari-jari = 20 cm AOB = 54 CM HITUNGLAH luas juring oab

[tex]l.juring \: aob \: = \frac{sudut \: aob}{360} \times l.lingkaran \\ = \frac{54}{360} \times \pi. {r}^{2} \\ = \frac{3}{20} \times 3.14 \times {20}^{2} \\ = \frac{3}{20} \times 1256 \\ = 3 \times 62.8 \\ l.juring= 188.4[/tex]