Tiga kubus berukuran 1m³, 8m³.dan 27m³ ditumpuk seperti tampak pada gambar disamping. Tentukan jumlah luas permukaan tumpukan...

<p><strong>1. Cari panjang rusuk masing-masing kubus&nbsp;</strong></p><p>- Kubus A (Yang paling atas) : 1 cm³ = x³ = 1³</p><p>&nbsp; <u>Panjang rusuk kubus A = 1 m</u></p><p>- Kubus B (Di tengah) : 8 cm³= x³= 2³</p><p>&nbsp; <u>Panjang rusuk kubus B = 2 m</u></p><p>- Kubus C (Paling bawah) : 27 cm³ = x³ = 3³&nbsp;</p><p>&nbsp; <u>Panjang rusuk kubus C = 3 m</u></p><p>&nbsp;</p><p><strong>2. Cari luas permukaan total</strong></p><p>Luas permukaan total = Luas permukaan A + Luas permukaan B + Luas permukaan C</p><p><strong>Tapi, karena kubus-kubus tersebut bertumpukan, tidak semua sisi digunakan. Ada sisi yang tertimpa juga, sehingga luasnya berkurang.</strong></p><p>&nbsp;</p><p>Luas permukaan A = Sisi x sisi x (jumlah sisi yang menghadap luar)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 1 x 1 x (5)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= <u>5 m</u>^<u>2</u></p><p>Luas permukaan B = Sisi x sisi x (4) + (luas permukaan B - luas sisi A)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 2 x 2 x 4 + (2 x 2 - 1)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 16 + 3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= <u>19 m</u>^<u>2</u></p><p>Luas permukaan C = Sisi x sisi x (4) + (Luas permukaan C - Luas sisi B)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 3 x 3 x 4 + (3 x 3 - 4)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 36 + 5</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= <u>41 m</u>^<u>2</u></p><p>&nbsp;</p><p><strong>3. Totalkan semuanya</strong></p><p>Luas permukaan total = Luas permukaan A + Luas permukaan B + Luas &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; &nbsp; &nbsp; permukaan C</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; = 5 + 19 + 41&nbsp;</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; = <strong><u>65 m</u>^<u>2</u></strong></p><p>&nbsp;</p><p>Jadi, luas permukaan total nya adalah <strong>65 m²</strong></p><p>&nbsp;</p><p>Lah kok ga ada di pilihan jawaban ya 🤔?</p><p>Wes pokoknya gitu deh, kalau gitu ambil yang mendekati deh, <strong>D. 64 m²</strong></p><p>Terima kasih, jika ada yang salah bisa dikoreksi 🙏🏻.&nbsp;</p>