Tolong dijawab

<p>Luas permukaan Prisma (L_p)</p><p>L_p = 2 x luas alas + Keliling alas x tinggi prisma</p><p>&nbsp; &nbsp; &nbsp;= (2 x 1/2 x 4 x 5) + ((5 + 4 + 8) x 12)</p><p>&nbsp; &nbsp; &nbsp;= 20 + (17 x 12)</p><p>&nbsp; &nbsp; &nbsp;= 20 + 204</p><p>&nbsp; &nbsp; &nbsp;= 224 cm²</p><p>&nbsp;</p><p>Luas Limas segiempat (L_s)</p><p>Jaring-jaring pada gambar adalah jaring-jaring limas dengan alas berbentuk persegi. (Jadi bukan kubus)</p><p>L_s = Luas alas + 4 x luas sisi tegak</p><p>&nbsp; &nbsp; &nbsp;= (10 x 10) + (4 x 1/2 x 10 x 8)</p><p>&nbsp; &nbsp; &nbsp;= 100 + 160</p><p>&nbsp; &nbsp; &nbsp;= 260 cm²</p><p>&nbsp;</p><p>Luas seluruhnya = L_p + L_s</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 224 + 260</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 484 cm²</p><p>&nbsp;</p><p>Luas karton = 20 x 25</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 500 cm²</p><p>Karena luas karton &gt; Luas seluruhnya maka <strong>Ria dapat membuat dua bangun ruang tersebut</strong>.</p><p>&nbsp;</p><p>Sisa karton = 500 - 484 = <strong>16 cm²</strong></p>