[Problem] Express the area and edge length of a cube as a function...

This is a problem video in my precalculus playlist.
I am going to be solving the following problem.
"Express the edge length of a cube as a function of it's diagonal length D. Then express the surface area and volume of the cube as a function of D. "

[@shaafsalman1024]

Great try to reduce time be to the point

[@francescaphilemon3279]

the last answer should be d^3 square root 3 /9

[@ahnaftahmid8325]

I'm the first one to comment on this video!

[@Azanali_2125]

problem in thomas calculus