ka tolong bantu ya sma caranya

Luas lingkaran = 22/7 x 7 x 7 = 154

Luas juring = 72/360 x 154 = 30,8

luas juring = sudut AOB/360 × πr²
= 72/360 × 22/7 × 7 × 7
= 1/5 × 154
= 30,8 cm²