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<p>Jawaban yang tepat adalah</p><ul><li>&nbsp;AC = 36 cm</li><li>&nbsp;Luas juring OCB = 1/6 x Luas Lingkaran</li></ul><p>&nbsp;</p><p>Pembahasan :</p><p>&lt;AOC = 120°</p><p>&lt;BOC = 180° - &lt;AOC</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 180° - 120°</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 60°</p><p>BC = 18 cm</p><p>a. BC/AC = &lt;BOC/&lt;AOC</p><p>&nbsp; &nbsp; &nbsp;18/AC = 60°/120°</p><p>&nbsp; &nbsp; &nbsp; 18/AC = 1/2</p><p>&nbsp; &nbsp; &nbsp; AC = 36 cm</p><p>&nbsp;</p><p>b. Luas juring OCB</p><p>&nbsp; &nbsp; &nbsp;Luas Juring OCB = (&lt;BOC/360°) x Luas Lingkaran</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = (&lt;BOC/360°) x 𝞹r²</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = (60°/360°) x 𝞹r²</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 1/6 x 𝞹r²</p><p>&nbsp; &nbsp; &nbsp;Karena jari-jari lingkaran tidak diketahui maka kesimpulannya adalah&nbsp;</p><p>&nbsp; &nbsp; &nbsp;Luas juring OCB = 1/6 x Luas Lingkaran</p>