Jawabanmu

2014-04-21T14:58:02+07:00
Misal:P=5x;L=3x;T=2x volume balok=p.l.t=1920=5x.3x.2x=1920cmkubik=30x pangkat 3 ; x=√1920:30=8 A.P=5x=5x8=40 cm;L=3x=3x8=24 cm;T=2x=2x8=16 cm; B.luas permukaan balok=2x(pxl)+(pxt)+(lxt)= 2x(40x24)+(40x16)+(24x16)=2944 cm persegi