Question 1163752
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The point F is the point of intersection of the two diagonals of the base.<br>
Triangle ATF is a right triangle.  You know AT is 27cm; you can determine AF from the given side length of the square base.  So you will be able to find the height of the pyramid from the Pythagorean Theorem.<br>
Then use that height and the area of the base to find the volume.<br>
I leave the calculations to you.<br>
Note that the height turns out to be a whole number.  If you aren't getting that result, there is something wrong with your calculations.<br>