Hitunglah luas lingkaran yang memiliki: a. Jari-jari 10 cm b. diameter 14 cm c. keliling 22 cm

[tex]a) l = \pi {r}^{2} \\l = 3.14 \times 10 \times 10 \\ = 314 \\ b)d = 14 \\ r = 7 \ \\ \ l = \frac{22}{7} {7}^{2} \\ = 154 \\ k = 2 \pi \: r \\ 22 = 2\pi \: r \\ r = \frac{11}{3.14} \\ r = 3.5 \\ l= \frac{22}{7} {3.5}^{2} \\ = 38.5[/tex]
jdikan yg trbaik dan ikuti