perhatikan gambar diketahui

[tex]a.2\pi \: r \\ 2 \times 3.14 \times 10 \\ 62.8 \\ b.\pi \: r { }^{2} \\ 3.14 \times 10 {}^{2} \\ 314 \\ c.45 \div 360 \times 2\pi \: r \\ 1 \div 8 \times 2 \times 3.14 \times 10 \\ 1 \div 8 \times 62.8 \\ 7.85 \\ d.45 \div 360 \times \pi \: r {}^{2} \\ 1 \div 8 \times 3.14 \times 10 {}^{2} \\ 1 \div 8 \times 314 \\ 39.25[/tex]
#semoga bermanfaat

Keliling lingkaran 62,8 cm
luas lingkaran 314 cm^2
panjang busur AB 7,85 cm
luas juring AOB 39,25 cm^2