Diketahui balok panjangnya (3x+2)cm,lebar (x+5)cm dan tinggi (2x-4)cm, jika jumlah panjang rusuk 156cm,maka : a.susunlah persamaan x b.tentukan nilai x c.luas permukaan balok d.volume
Zuhh
Dik : panjang = (3x+2) lebar = (x+5) tinggi = (2x-4) panjang rusuk = 156 cm
maka : a. panjang rusuk = 4 x [3x+2 + x+5 + 2x-4] 156 = 4 x (6x + 3) 156 = 24x + 12
b. nilai x = 156 = 24x + 12 24x = 156 - 12 x = 144/24 x = 6 cm
panjang = 3(6) + 2 = 20 lebar = 6+5 = 11 tinggi = 12 - 4 = 8
c. Lp = 2 x (20x11 + 20x8 + 11x8) = 2 x (220 + 160 + 88) = 2 x 468 = 936 cm²
panjang = (3x+2)
lebar = (x+5)
tinggi = (2x-4)
panjang rusuk = 156 cm
maka :
a. panjang rusuk = 4 x [3x+2 + x+5 + 2x-4]
156 = 4 x (6x + 3)
156 = 24x + 12
b. nilai x =
156 = 24x + 12
24x = 156 - 12
x = 144/24
x = 6 cm
panjang = 3(6) + 2 = 20
lebar = 6+5 = 11
tinggi = 12 - 4 = 8
c. Lp = 2 x (20x11 + 20x8 + 11x8)
= 2 x (220 + 160 + 88)
= 2 x 468
= 936 cm²
d. Volume = 20 x 11 x 8
= 1.760 cm³