hitunglah keliling dan luas daerah yg diarsir

f. keliling
[tex] \frac{1}{2} [/tex]
[tex]\pi \times {r}^{2} [/tex]
[tex] \frac{22}{7} \times \frac{1}{2} \times 3.5 \\ = \frac{1}{2} \times 22 \times 0.5 \\ =11 \times 0.5 \\ = 5.5cm[/tex]
keliling
[tex] \frac{1}{4} [/tex]
[tex]2 \times \frac{1}{4} \times \pi \times r \\ = 2 \times \frac{1}{4} \times \frac{22}{7} \times 3.5 \\ = \frac{1}{2} \times 22 \times 0.5 \\ = 5.5cm[/tex]
maaf kalau salah