tentukan panjang jari-jari lingkaran yang luasnya 1.256 cm²

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Mapel : Matematika
Tentang : Bangun Datar
Pembahasan :

Diketahui :
- L = 1256 cm²

Ditanya :
- r

L = πr²
1256 = 3,14 x r²
r² = 1256/3,14
r = √400
r = 20 cm

Jawaban : 20 cm

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Heil Manstein!

luas lingkaran=
[tex]\pi \times {r}^{2} [/tex]
[tex]3.14 \times {r}^{2} [/tex]
luas lingkaran : 3,14
=1256:3,14
=400
=
[tex] \sqrt{400} [/tex]
[tex] {r}^{2} = 20[/tex]
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