Answer:
The volume is
![2556657m^(2)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ftznyko8e355ma63mvekm26hdmm8a370rd.png)
Explanation:
This problem brothers on the mensuration of solid shapes, a square based pyramid.
Given data
Volume v = ?
length of base a= 230m
Height h= 145m
Since we are required to solve for the volume of a square based pyramid, the expression for he volume is
![v= a^(2) *(h)/(3)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/gpqhwud0cfm0yzo5gox17xpgrnwlenmr55.png)
Substituting our data into the formula we have
![volume= 230^(2)*(145)/(3)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/vnwniyfafmaw5iyv8429pegkbbnuzus2a0.png)
![volume= 52900*48.33\\volume= 2556657m^(2)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/3gzzzpjr99876ff5gsmak1vx1mwlphlbyo.png)
Hence the volume of the stones needed is is
![2556657m^(2)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ftznyko8e355ma63mvekm26hdmm8a370rd.png)