If a rectangular prism is h=10 inches an W=2 inches

would the length be 8 inches

how do I find the length

Same question for a Rectanguler prism with a h=8 inches w=2.5 inches

would the length be 8 inches or 5 inches

1 answer

if you are given only two of the dimensions, there is no way to determine the third.

You need to know the volume, or the area, or a diagonal -- something to pin down that third dimension.