Question

Perbandingan ukuran panjang,lebar,tinggi suatu balok adalah 5:4:2.jija volume balok tersebut adalah1.080cm3 maka luas alasnya adalah

Answer 1

Volume = PLT

5x.4x.2x = 1080
40x³ = 1080
x³ = 1080 / 40
x³ = 27
x = ∛27
x = 3

panjang = 5 * 3 = 15 cm
lebar = 4 * 3 = 12 cm
tinggi = 2 * 3 = 6 cm

luas alas = PL
= 15.12
= 180 cm²

Answer 2

Rasio p : l : t = 5 : 4 : 2
V = 1.080 cm³
misal
p = 5x
l = 4x
t = 2x
V = plt
1.080 = 5x × 4x × 2x
40x³ = 1.080
x³ = 27
x = 3
Jadi
p = 5x = 15
l = 4x = 12
t = 2x = 6
Luas alas = p × l
L.alas = 15 × 12 = 180 cm²