tolong bantu

<p>ok saya bantu jawab ya....</p><p>1. &lt;AOB = 120° dan &lt;BOC = 75°</p><p>&nbsp; &nbsp; &nbsp;Busur BC = 50 cm</p><p>&nbsp; &nbsp; &nbsp;&lt;BOC/&lt;AOC = Busur BC/Busur AC</p><p>&nbsp; &nbsp; &nbsp;75°/120° = 50/Busur AC</p><p>&nbsp; &nbsp; &nbsp;5/8 = 50/Busur AC</p><p>&nbsp; &nbsp; Busur AC = (8 x 50)/5</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 80 cm</p><p>&nbsp;</p><p>2. L.AOB = 63 cm³</p><p>&nbsp; &nbsp; &nbsp;&lt;AOB = 105° dan &lt;DOC = 75°</p><p>&nbsp; &nbsp; &nbsp;&lt;DOC/&lt;AOB = L.DOC/L.AOB</p><p>&nbsp; &nbsp; &nbsp;75°/105° =L.DOC/63</p><p>&nbsp; &nbsp; &nbsp;5/7 = L.DOC/63</p><p>&nbsp; &nbsp; &nbsp;L.DOC = (63 x 5)/7</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 45 cm²</p><p>&nbsp;</p><p>3. &lt;ABD = 65°</p><p>&nbsp; &nbsp; &nbsp;&lt;BAC = &lt;ABD = 65° (karena segitiga AOB adalah segitiga samakaki&nbsp;</p><p>&nbsp; &nbsp; &nbsp;dimana &nbsp; AO = BO)</p><p>&nbsp; &nbsp; &lt;AOB = 180° - (&lt;BAC + &lt;ABD)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 180° - (65° + 65°)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 180° - 130°</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 50°</p><p>&nbsp; &nbsp; &nbsp;&lt;BOC = 180° - &lt;AOB</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 180° - 50°</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = <strong>130°</strong></p>