Tolong dengan caranya ya makasih

1. πd= 22/7x 210=22x30=660

2.kell lingk=πd = 22/7.77=2.11=22

3. kell = πd = 3,14 x 50cm= 157 cm
157x200=31400cm=314m

4. kell = 132 = πd =
22/7d
132:22x7=d
42=d 21=r

1. 2πr= 2×(22/7)×105= 4620/7= 660cm
2. πd= (22/7)×77= 22×11= 242m
3.
4. 2πr= 132
2(22/7)r= 132
(44/7)r= 132
r = (132×7)/44
r= 21
5.