Jawabanmu

2014-05-21T10:13:44+07:00
Perbandingan p:l:t = 3 : 2 :4
Luas balok = 1.300 cm^2

Luas permukaan balok = 2 (pl +pt +lt)
1.300 = 2 (3x*2x + 3x*4x + 2x*4x)
1.300 = 2 (6x^2 + 12x^2 + 8x^2)
1.300 = 2 (26x^2)
1.300 = 52x^2
x^2 = 1.300/52
x^2 = 25
x = akar25
x = 5

Panjang= 3*x = 3*5 = 15 cm
Lebar = 2*x = 2*5 = 10 cm
Tinggi = 4*x = 4 *5= 20 cm

Jadi volume balok = p*l*t = 15 * 10 * 20 = 3.000 cm^3.
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