Toloong yaa

<p>(1)</p><p>Diketahui :&nbsp;</p><ul><li>Luas tutup dus (s²) = 81 cm²</li><li>Banyak sisi dus = 6 sisi</li><li>Dus berbentuk kubus&nbsp;</li></ul><p>Ditanya : luas permukaan dus</p><p>Jawab :</p><p>Luas permukaan dus = (s²)×6</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 81×6</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = <u>486 cm²</u></p><p>(2)</p><ul><li>Luas segitiga = (a×t)/2&nbsp;</li><li>Luas persegi panjang = p×l</li></ul><p>Jawab :</p><p>Luas persegi panjang 1 = 12×18 = 216 cm²</p><p>Luas persegi panjang 2 = 16×18 = 288 cm²</p><p>Luas persegi panjang 3 = 20×18 = 360 cm²</p><p>Luas 2 segitiga = (2(a×t))/2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = (2(12×16))/2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = (2×192)/2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 384/2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 768 cm²</p><p>Luas seluruh permukaan&nbsp;</p><p>= 768 + 360 + 288 + 216 = <u>1632 cm²</u></p><p>&nbsp;</p>