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√(12a)²+(4a)²+(3a)² = 26
144a²+16a² + 9a² =26²
169a² = 676
a² = 4
a= 2
p= 12a = 24
L=4a=8
t= 9a= 18
vol=p l t = 24 . 8 , 18 = 3.456 cm²