Kisi kisi ujian nya bisa ditolong kk

18.luas juring/22/7x28²=90/360
   luasjuring/2464=1/4
luas juring=2464/4=616
19. 18/busur mn=60/120
       18x2=busur mn=36
20.110/2=55
21.lon=180°
kol=2x60=120
nok=180-120=60
22.df=8²+6²=10cm
s=8+6+10/2=12cm
luas=√12(12-10)(12-8)(12-6)
      =√6√2√2√4√6
      =6x2x2=24
r=24/12=2cm
24.14-8=6
10²-6²=8cm

Lj COD = 22/7 x 28²/4 = 22 x 28 = 616 cm²