panjang jari jari nya...cm

Keliling = 2 × π × d
22 cm = 2 × 3, 14 × r
r = 3, 50 cm

Please, let me answer your question :)
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Mapel : Matematika
Tentang : Bangun Datar
Pertanyaan yg diajukan : 1
Pembahasan :

Diketahui :
- Keliling (K) : 22 cm

Ditanya :
- Jari - Jari (r)

Cara :

[tex]k = 2 \times \pi \times r \\ \\ 22 = 2 \times \frac{22}{7} \times r[/tex]

[tex]22 = \frac{44}{7} \times r \\ \\ r = \frac{22}{ \frac{44}{7} } [/tex]

[tex]r = 22 \times \frac{7}{44} \\ \\ r = 0.5 \times 7[/tex]

[tex]r = 3.5 \: cm[/tex]

Jadi, Panjang jari - jari lingkaran yg memiliki keliling 22 cm adalah 3,5 cm. Jawabanmu yg D

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Hopefully this is the best for you. And please, MAKE BRAINLY GREAT AGAIN!!!

✚ Heil Manstein! ✚