tolong kak dijawab dicari luasnya

1. [tex] \pi r^{2} [/tex]
= 22/7 * 7 * 7
= 22 * 7
= 154 cm^
2. [tex] \pi r^{2} [/tex]
= 22/7 * 17,5 * 17, 5
= (hasilnya hitung sndri males kalo ngitung ada koma"nya )
3. [tex] \frac{1}{4} \pi r^{2} [/tex]
= 1/4 * 22/7 * 7 * 7 
= 38,5 cm^
4 L 1 lingkarang + L 1/2 ling.
= [tex] \pi r^{2} + \frac{1}{2} \pi r^{2} [/tex]
= 22/7 * 7 * 7 + 1/2 * 22/7 * 7 *7
= 154 + 77
= 231 cm^
5. [tex] \frac{3}{4} \pi r^{2} [/tex]
= 3/4 * 22/7 * 14 * 14
= 462 cm^