2. Panjang rusuk = 4( p + l + t )
180 = 4[ ( 3x + 2 ) + ( x + 5 ) + ( 2x - 4 ) ]
180/4 = 6x + 3
45 = 6x + 3
45 - 3 = 6x
42 = 6x
x = 7 cm( B. )
Kerangka balok = 4( p + l + t )
= 4( 13 + 9 + 8 )
= 4(30)
= 120 cm
7,2m = 7,2(100) = 720 cm
Kerangka balok = 720/120 = 6 buah
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2. Panjang rusuk = 4( p + l + t )
180 = 4[ ( 3x + 2 ) + ( x + 5 ) + ( 2x - 4 ) ]
180/4 = 6x + 3
45 = 6x + 3
45 - 3 = 6x
42 = 6x
x = 7 cm( B. )
Kerangka balok = 4( p + l + t )
= 4( 13 + 9 + 8 )
= 4(30)
= 120 cm
7,2m = 7,2(100) = 720 cm
Kerangka balok = 720/120 = 6 buah