Tentukan luas lingkaran jika kelilingnya 44cm

[tex]k = 2\pi \: r[/tex]
[tex]44 = 2 \times \frac{22}{7} \times r \\ 44 = \frac{44}{7} r \\ r = 44 \times \frac{7}{44} \\ r = 7 \\ [/tex]
[tex]luas \: = \pi {r}^{2} \\ \: \: \frac{22}{7} \times 7\times 7\\ =154 {cm}^{2} [/tex]