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: <boc = 150 derajat
; luas juring aob = 84cm³
dit : luas boc...?//
<aob / <boc = luas aob / luas boc
120 / 150 = 84 / luas boc
120 luas boc = 12600
luas boc = 12600/120
= 105cm²
⇒<AOB/<lingkaran dikali L. Lingkaran = 51 1/3cm²
⇒120/360 × L. Lingkaran = 154/3cm²
⇒1/3 × L. Lingkaran = 154/3 cm²
⇒L.Lingkaran = 154/3 ×3/1
⇒L. Lingkaran = 154 cm²
Luas juring BOC!
⇒<BOC/<L. Lingkaran =
⇒150/360 × 154cm² =
5/12 × 154 cm² = 64 2/12 cm²
= 64 1/6 cm² (64,167cm²)
jadi pasti jawabannya yang C. 385/6 cm²