"rektangular prism"=xtra speshal krat-krat-krat super-kart super-talk
in normal krat-speek its "rektangular solid"
in normal Amerikan, its a BOX
volume=500, 1 posabel anser=kube, if kube, evree side=third root(500)
=7.937005095
but maebee 1 side is 10, then 2 other sides kan be sqrt(50)=7.07`0678`1
or maebee leng=10 & hite=10, then other direkshun=5