tentukan panjang jari-jari lingkaran yang luasnya 1.256cm t

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

Diketahui :
- Luas (L) : 1.256 cm²

Ditanya :
- Jari - jari (r)

Cara :

[tex]l = \pi \times {r}^{2} \\ \\ 1.256 = 3.14 \times {r}^{2} [/tex]

[tex] {r}^{2} = \frac{1256}{3.14} \\ \\ {r}^{2} = 400[/tex]

[tex]r = \sqrt{400} \\ \\ r = 20 \: cm[/tex]

Jawaban : 20 cm

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Hopefully this is the best for you.

MAKE BRAINLY GREAT AGAIN!!!

Heil Manstein!

[tex]luas \: lingkaran \: = \: \pi \: \times \: r {}^{2} \\ 1256 = 3.14 \: \times \: r {}^{2} \\ r {}^{2} \: = \: \: 1256 \: \div \: 3.14 \\ r {}^{2} \: = \: 400 \\ r \: = \: \sqrt{400} \\ r \: = \: 20 \: cm[/tex]

SEMOGA MEMBANTU :)