Question 1206965
.


Notice that in the post by @MathLover1, the first line formula is the formula
for a cone volume, not for a pyramid volume.


It is written by mistake and is irrelevant to the given problem.



Regarding wording this post by its author/creator, this fragment "Provide a proof for your answer"
tells that the author is NOT familiar with standard mathematical formulations of Math problems.



I insistently recommend to the managers of this project to REMOVE this writer
IMMIDIATELY from his/her position in the project due to his/her illiteracy in Math.



It is extremely important to do it without delay in order for 
this writer does not disgrace your esteemed organization.



///////////////////



After seeing my post, @MathLover1 corrected her mistake.