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76= 4(x+3)+4x+4(x-2)
76= 4x+ 12+ 4x+ 4x- 8
76= 12x+4
12x= 72
x= 6
p= 6+3= 9cm
l= 6 cm
t= 6-2= 4 cm
V= p. l. t= 9. 6. 4= 216 cm3
l= x
t= x - 2
Jumlah rusuk= 76 cm
76= 4(x + 3 + x + x - 2)
76 / 4= (x + x + x + 3 - 2)
19= 3x + 1
19 - 1= 3x
18= 3x
x= 18/3
x= 6
Maka, panjang, lebar dan tingginya adalah :
p= x + 3
= 6 + 3
= 9 cm
l= x
= 6 cm
t= x - 2
= 6 - 2
= 4 cm
Maka, Volumenya adalah :
V. balok :
p × l × t
9 × 6 × 4
54 × 4
216 cm³