please kerjain nomer 4 aja ya! nanti harus dikumpul

8X3,5=28 cm2 (Bangun 1)
3,14X1,525X1,525=7,30 cm 2 (bangun 2)
28+7,30=35,30 cm2

maaf klo salah

luas=22/7.3,5/ 2.3,5/2+8.3,5=9,625+28=37,625 cm2