Length can be measured in feet, inches and centimetres
Those are all units of length or distance.
The square of any unit of length or distance is a unit of area.
That depends on the units the radius is measured in. Radius is a distance and can be measured using any unit of length.
for the SI units of measurements, length is measured in meters. for anything else, length is measured in inches, feet, yards, etc.
None. Area cannot be measured in length units - only in squares of such units.
The length, width, or height of a solid figure is measured in units of length. The area of the figure's outside surfaces is measured in squared units of length. The volume of space filled by the figure is measured in cubed units of length. The mass of the figure is measured in units of mass. The weight of the object is measured in units of force. The age of the figure is measured in units of time. etc.
Length, width and height are all measurements of distance. Distance is measured in meters (metric system) or inches/feet/miles (imperial system).
It is the distance between the end points of a line measured using Imperial units.
The four units that distance can be measured in are . . .inchesmetersyardskilometersmilescentimetersfeetparsecsmillimetersfurlongsastronomical unitsnanometersSmootsleagueslight yearsThere are also some others.
No line can be measured in units since they are all infinite in length.
In the International System (SI), a length or distance is measured in meters, or some multiple like km., mm., etc.