Answer: 12 cm
The other guy that answered didn't do it correctly, he didn't find the height. You have to do:
1/3 (9 • 9) (x) = 324
1/3 • 81x = 324
27x = 324
x = 12
Trust me, I just finished my quiz and got ths answer right.
V=1/3bh324=1/3(9)* h 324=3hh=324/3h=108
height is 108cm
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