What is the first step in problem solving

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)

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2