tolong ya kak No 1-5 sama caranya

lanjutannya
4. luas = 155
πr² =154
22/7r² =154
r²= 154 : 22/7
r²=154×7/22
r²= 7 × 7
r =√49
r = 7

d= 7×2= 14cm
kll =πd
22/7×14
44cm

5. luas = πr²
22/7r² =616
r² =616:22/7
r²= 616×7/22
r²=28×7
r =√196
r= 14

d= 14×2= 28
kll =πd
22/7 ×28
88 cm