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put this solution on YOUR website!The solid figure would be two right circular cones, base to base. The pertinent dimensions of one of the cones, namely the radius of the base and the height of the cone, would both measure one-half the measure of the diagonal of the square.
Since the square has a side of 6, the diagonal measures

, therefore half of the diagonal would measure

.
The formula for the volume of a right circular cone in terms of the height and the radius of the base is:

and since there are two such cones, we need to multiply this volume by 2, hence our total volume is given by: