di jawab pakai cara ya

luas = 45˚/360˚
= 1 / 8
maka = 1 / 8 x 22/7 x 7 x 7
= 1 / 8 x 154
= 19 , 25

45°/360° = ? / phi × r^2
= 1/8 = ? / 22/7 × 7^2
= 1/8 = ? / 154 ( dikali silang )
8 ? = 154 × 1
? = 154/8
? = 19,25 cm^2
Jawaban A
Semoga membantu