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L = 2x[(pl)+(pt)+(lt)]
1920 = 2x[(5ax2a) + (5ax3a) + ( 2ax3a)]
1920 = 2x[10a²+15a² +
6a²)]
1920 = 2x 31a²
1920 = 62a²
a² = 1920/62
a² = 30,96
a=√30,96
a= 5,5
p= 5a = 5x5,5 = 27,5cm
l = 2a = 2x5,5 = 11 cm
t = 3a = 3x5,5 = 16,5 cm
V = pxlxt
V = 27,5 x 11x 16,5
V = 4991,25 cm3