Tentukan jari-jari lingkaran jika diketahui keliling 88cm

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

Diketahui :
- Keliling (K) : 88 cm

Ditanya :
- Jari - Jari (r)

Cara :

[tex]k = 2 \times \pi \times r \\ \\ 88 = 2 \times \frac{22}{7} \times r[/tex]

[tex]88 = \frac{44}{7} \times r \\ \\ r = \frac{88}{ \frac{44}{7} } [/tex]

[tex]r = 88 \times \frac{7}{44} \\ \\ r = 2 \times7 \\ \\ r = 14 \: cm[/tex]

Jadi, Jari - jarinya adalah 14 cm

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

✚ Heil Manstein! ✚

K lingkaran = 2 x phi x r
88 m = 2 x 22/7 x r
88 m = 44/7 r
r = (88 x 7)/44
= 616/44
= 14 m

Jadi, jari-jarinnya adalah 14 meter.

Semoga membantu:)