Jika sebuah lingkaran memiliki keliling 22 cm, maka luas lingkaran tersebut adalah

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Mapel : Matematika
Tentang : Bangun Datar
Pembahasan :

Diketahui :
- K = 22 cm

Ditanya :
- L

K = πd
22 = 22/7 x d
d = 22/22/7
d = 22 x 7/22
d = 1 x 7
d = 7 cm

L = ¼ x πr²
L = ¼ x 22/7 x 7 x 7
L = ¼ x 22 x 7
L = ¼ x 154
L = 38,5 cm²

Jadi, luasnya adalah 38,5 cm²

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[tex]k = 2\pi \times r = 22 \: \: \: \: - - > r = \frac{11}{\pi} \\ l = \pi \times {r}^{2} = \pi \times \frac{11}{\pi} \times \frac{11}{\pi} = \frac{121}{\pi} [/tex]