volume = 1/2 x a x b x X
1152= 1/2 x 12x 12 x X
12*12 = 144
1152 = 1/2 x 144 x X
1152/ 1/2 = 2304
2304 =144 x X
X=2304/144 = 16
check 1/2*12*12*16 = 1152
x=16cm
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