Hitunglah jari jari lingkaran yang luas 154cm

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

Diketahui :
- Luas (L) : 154 cm²

Ditanya :
- Jari - Jari (r)

Cara :

[tex]l = \pi \times {r}^{2} \\ \\ 154 = \frac{22}{7} \times {r}^{2} [/tex]

[tex] {r}^{2} = \frac{154}{ \frac{22}{7} } \\ \\ {r}^{2} = 154 \times \frac{7}{22} [/tex]

[tex] {r}^{2} = 7 \times 7 \\ \\ r = \sqrt{49} = 7 \: cm[/tex]

Jadi, Panjang Jari - Jari Lingkaran yg memiliki Luas 154 cm² adalah 7 cm

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

✚ Heil Manstein! ✚

L=phi×r2
154=10r
r=154/10
r=15,4