Lines are measured with lines. For example, the length of a road is measured with standard lines (linear units) such as yards, miles, meters or kilometers.
Areas are measured with areas. A field is measured with standard areas (usually square units) such as square yards, square miles, or square kiometers.
Volumes are measured with volumes. A container is measured with standard volumes (often cubic units) such as square inches or square centimeters.
Look out for calculations involving linear, square and cubic units. For example, a square measuring three inches on the side has an area of 3 x 3 = 9 square inches. A cubical tank measuring five meters on each side has a volume of 5 x 5 x 5 = 125 cubic meters.
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You can't convert that. You can convert linear units to linear units, square units to square units, or cubic units to cubic units.
A rectangle has a perimeter with linear units, and a surface area with square units. It has no cubic units.
A linear unit is used to measure length or distance whereas a cubic unit is used to measure volumes. A cubic unit may defined as a cubic measure (eg a litre) or it could be composed of three linear units (eg cubic centimetre), or a square unit and a linear one (acre-foot). This last combination is rare in the SI system because the linear units are more easily linked to square and cubic units.
You don't convert square units to linear units. The two are utterly incompatible.You don't convert square units to linear units. The two are utterly incompatible.You don't convert square units to linear units. The two are utterly incompatible.You don't convert square units to linear units. The two are utterly incompatible.
You simply can't convert square units to cubic units.