tolong dong aq nyari gak dapa dapat

NOMOR 15

keliling daerah arsir
= busur lingkaran besar + busur lingkaran kecil + 2(selisih jari-jari)
= [90°/360° × (2) × (3,14) × (10)] + [90°/360° × (2) × (3,14) × (7)] + 2(10-7)
= [1/4 × (2) × (3,14) × (10)] + [1/4 × (2) × (3,14) × (7)] + 2(3)
= [1/2 × (3,14) × (10)] + [1/2 × (3,14) × (7)] + 6
= (1,57 × 10) + (1,57 × 7) + 6
= 15,7 + 10,99 + 6
= 32,69 cm

jawabannya C