Carilah kelilingnya 1.d=30 2.d=40 3.r=14 4.r=28
No. 1
- d = 30 cm
K = π × d
K = 3,14 × 30
K = 94,2 cm ✔
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No. 2
- d = 40 cm
K = π × d
K = 3,14 × 40
K = 125,6 cm ✔
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No. 3
- r = 14 cm
K = π × d
K = 22/7 × (14 × 2)
K = 22/7 × 28
K = 22 × 4
K = 88 cm ✔
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No. 4
- r = 28 cm
K = π × d
K = 22/7 × (28 × 2)
K = 22/7 × 56
K = 22 × 8
K = 176 cm ✔