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31,4 = 3,14 x d
d = 10 cm
K = πd
K = 22/7 x 21
K = 66 cm
31,4 = 2 × 3,14 × r
31,4 = 6,28 × r
6,28×r = 31,4
r =
= 5
d = 2r
= 2 × 5 = 10
jadi diameterny adalah 10 cm
2. d = 21 cm = 10,5 r
K = 2 r
= 2 × × 10,5
= 66 cm
maaf kalau salah