Question 1037541
Volume of the pyramid: 1/3 A*h, where A is the area of the base (length*width) and h is the height.
:
12*8 = 96
96*8 = 768
1/3*768 = 256 is the volume
----------------------
256-40 = 216
216*3/1 = 648
648/96 = 6.75 tall