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panjang = 20 (5×4)
lebar = 5 (5×1)
tinggi = 15 (5×3)
= 2 ([100]+[300]+[75])
= 2 (475)
= 950 cm
semoga membantu:)
perbandingan tingginya 3 ⇒ tinggi sbnrnya 15cm
jadi ⇒ 3x = 15
x = 5
panjang balok = 4x ⇒ 4(5) = 20cm
lebar balok = 1x ⇒1(5) = 5cm
luas permukaan balok = 2(p x l) + 2(p x t) + 2(l x t)
2(20 x 5) + 2(20 x 15) + 2(5 x 15)
200 + 600 + 150
950cm²
maaf jika salah