hitungla luas lingkaran ya berjari 20cm

L = [tex] \pi r^{2} [/tex]
= 3,14 x [tex] 20^{2} [/tex]
= 3,14 x 400
= 1.256 [tex] cm^{2} [/tex]

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