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l = 2/3 x 9 = 6 cm
t = 4/3 x 9 = 12 cm
Lp = (2xpxl) + (2xpxt) + (2xlxt)
Lp = (2x9x6) + (2x9x12) + (2x6x12)
Lp = 108 + 216 + 144
Lp = 468 cm^2
perbandingngan panjang 3 => 3x
9 = 3x
x = 3
lebar = 2x = 2(3) = 6cm
tinggi 4x = 4(3) = 12cm
LPBalok
= 2(9x6) + 2(9x12) + 2(6x12)
108 + 216 + 144
480cmkuadrat