Tolong

<p>Jawaban yang tepat adalah<strong> 84 cm²</strong></p><p>&nbsp;</p><p>Pembahasan :</p><p>Luas lembaran kaleng = 72 x 14</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;= 1.008 cm²</p><p>&nbsp;</p><p>Mencari luas permukaan kaleng (L)</p><p>r = 7 cm</p><p>t = 14 cm</p><p>𝞹 = 22/7</p><p>L = 2𝞹r² + 2𝞹rt</p><p>&nbsp; &nbsp; = 2𝞹r(r + t)</p><p>&nbsp; &nbsp; = 2.(22/7).7(7 + 14)</p><p>&nbsp; &nbsp; = 44 x 21</p><p>&nbsp; &nbsp; = 924 cm²</p><p>&nbsp;</p><p>Mencari Luas lembaran yang terbuang</p><p>Luas Terbuang = Luas lembaran kaleng - L</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 1.008 - 924</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 84 cm²</p><p>&nbsp;</p>