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Ditanya 7 jam yang lalu

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Ditanya 7 jam yang lalu

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Dijawab 5 jam yang lalu

<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 cm<sup>3</sup></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 cm<sup>2</sup></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>

ok saya bantu jawab ya....

1. <AOB = 120° dan <BOC = 75°

     Busur BC = 50 cm

     <BOC/<AOC = Busur BC/Busur AC

     75°/120° = 50/Busur AC

     5/8 = 50/Busur AC

    Busur AC = (8 x 50)/5

                        = 80 cm

 

2. L.AOB = 63 cm3

     <AOB = 105° dan <DOC = 75°

     <DOC/<AOB = L.DOC/L.AOB

     75°/105° =L.DOC/63

     5/7 = L.DOC/63

     L.DOC = (63 x 5)/7

                   = 45 cm2

 

3. <ABD = 65°

     <BAC = <ABD = 65° (karena segitiga AOB adalah segitiga samakaki 

     dimana   AO = BO)

    <AOB = 180° - (<BAC + <ABD)

                 = 180° - (65° + 65°)

                 = 180° - 130°

                 = 50°

     <BOC = 180° - <AOB

                  = 180° - 50°

                  = 130°


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