tolong jawab.......ya

30/60 = x/20
600 = 60x
x = 600÷60
= 10

21.
Luas juring QOR
= 30/60 × 20
= 10 cm2

22.
Besar sudut
x/360 × 3,14 × 10 × 10 = 62,8
×/360 = 62,8/314
× = 72°