What Irrational number between 1 and root 2?​

You will get 25 points an image of a rectangular prism is shown below: part a: a cross section of the prism is cut with a plane parallel to the base. what is the name of the shape created by the cross section? explain your answer. (5 points) part b: if a cross section of the prism is cut perpendicular to the base, what would be the shape of the resulting cross section? explain your answer. (5 points)

I'm confused on this could anyone me and show me what i need to do to solve it.

3x = 729 solve for x plz . it's urgent. will mark