kk tolong saya dari nomor 8 sampai 11.....terima kasih

8. L = 22/7 x 17,5 x ,17,5 = 962,5 m² (A)

9. besar sudut AOB = 2 x 40 = 80° (B)

10. 45/63° = n/42°
63 x n = 45 x 42
63n = 1890
n = 1890/63
n = 30 cm (A.)

11. Luas juring = 60°/360° x22/7x21x21
= 1/6 x 66 x21
= 231 cm² (A)