saya butuh bantuan kak huhuhu

6. keliling lingkaran = 12π
πd= 12π
d = 12cm
7. keliling lingkaran = 36π
πd = 36π
d = 36 meter
r = 1/2 d
r = 1/2 . 36
r = 18m
8. keliling roda = 22cm
πd = 22
22/7 . d = 22
d = 22 . 7/22
d = 7 cm
9. keliling lingkaran = 484
πd = 484
22/7 . d = 484
d = 484 . 7/22
d = 154 cm
r = 77 cm
10. keliling lingkaran = 3500
2πr = 3500
2 . 22/7 . r = 3500
r = 3500 . 7/44
r = 556,82 m