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a. jari-jari 49 m
= 22/7 x 49 x 2
= 308 m
b. jari-jari 21 m
= 22/7 x 21 x 2
= 132 m
c .jari-jari 5 cm
= 3,14 x 5 x 2
= 31,4 cm
d. jari-jari 12 cm
= 3,14 x 12 x 2
= 75,36 cm
e. jari-jari 10,5 cm
= 22/7 x 10,5 x 2
= 66 cm
f. diameter 70 cm
= 22/7 x 70
= 220 cm
g. diameter 2,8 cm
= 3,14 x 2,8
= 8,792 cm
h. diameter 15 m
= 3,14 x 15
= 47,1 m
i. diameter 50 m
= 3,14 x 50
= 157 m
j. diameter 2,4 cm
= 3,14 x 2,4
= 7,536 cm