Keliling lingkaran adalah 12,56 cm berapa jari jarinya?

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Mapel : Matematika
Tentang : Bangun Datar
Pertanyaan yg diajukan : 1
Pembahasan :

Diketahui :
- Keliling (K) : 12,56 cm

Ditanya :
- Jari - jari (r)

K = π x d
12,56 = 3,14 x d
d = 12,56/3,14
d = 4 cm

r = 4/2
r = 2 cm

Jawaban : 2 cm

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[tex]k = 2\pi \: r \\ 12.56 = 2 \times 3.14 \times r \\ 12.56 = 6.28 \times r \\ r = 12.56 \div 6.28 \\ r = 2 \: cm[/tex]