Berapa luas bangun yang diarsir?

<p>A.</p><p>Diketahui :&nbsp;</p><p>a = 14 cm</p><p>b = 8+14+8 = 30 cm</p><p>t = 7 cm&nbsp;</p><p>diameter = 14 cm -&gt; r (jari jari) = 14:2= 7 cm</p><p>𝞹 = 22/7 atau 3,14</p><p>&nbsp;</p><p>Ditanya :</p><p>Luas bangun yang diarsir</p><p>&nbsp;</p><p>Jawab :</p><p>&nbsp;Bangun ruang yang diarsir = Luas Trapesium - Luas ½Lingkaran</p><p>&nbsp;</p><p>Luas Trapesium = (a+b)x t / 2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = (14 + 30 ) x 7 / 2&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 44 x 7 / 2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 308 / 2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 154 cm²</p><p>&nbsp;</p><p>Luas ½ Lingkaran = ½ x 𝞹 x r²</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = ½ x 22/7 x 7²</p><p>^{&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;}= ½ x 22 x 7</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = ½ x 154</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 77 cm²</p><p>&nbsp;</p><p>Luas bangun yang diarsir</p><p>= Luas Trapesium - Luas Lingkaran</p><p>= 154 -77&nbsp;</p><p>= 77 cm²</p><p>^&nbsp;</p><p>B.&nbsp;</p><p>Ditanya : Selisih luas bangun yang diarsir dengan luas bangun yang tidak di arsir&nbsp;</p><p>Jawab :</p><p>&nbsp;Luas bangun yang di arsir - Luas bangun yang tidak di arsir</p><p>= Luas bangun yang di arsir - Luas ½ Lingkaran</p><p>= 77 - 77</p><p>= 0</p><p>&nbsp;</p>