It requires some information and then it calculates for eg. it can't calculate the area of trapezoid with the length of four sides it,requires top length,bottom length, height.with these information can calculate the area of the trapezoid
Not good maybe Oooit can have a camera
Only works forward, not backward from final data.
did not have a choice for a triangular prism, and maybe use a camera thing to solve it please
Very easy to use and does all I need it to do.
Very easy understanding