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Jawaban:
1) r = 49 m
K = 2 x π x r
K = 2 x ²²/ 7 x 49 m
K = 308 m
2) r = 21 m
K = 2 x π x r
K = 2 x ²²/ 7 x 21 m
K = 132 m
3) r = 5 cm
K = 2 x π x r
K = 2 x 3,14 x 5 cm
K = 31,4 cm
4) r = 12 cm
K = 2 x π x r
K = 2 x 3,14 x 12 cm
K = 75,36 cm
5) r = 10,5 cm
K = 2 x π x r
K = 2 x ²²/ 7 x 10,5 cm
K = 66 cm
6) d = 70 cm
K = π x d
K = ²²/ 7 x 70 c m
K = 220 cm
7) d = 1,5 m
K = π x d
K = 3,14 x 1,5 m
K = 4,71 m
8) d = 50 cm
K = π x d
K = 3,14 x 50 cm
K = 157 cm
9) d = 2 ,4 cm
K = π x d
K = 3,14 x 2,4 cm
K = 7,536 cm
https://id-static.z-dn.net/files/da4/73ea9e808dd384db743a97b4156dd1a4.jpg [answer.2.content]
