A rectangle has a perimeter with linear units, and a surface area with square units. It has no cubic units.
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Linear units, like inches, can't be converted to cubic units. If they could, then you'd be able to calculate your height in gallons.
It is: width times length times height measured in cubic units
A rectangle is two dimensional and cannot be cubic, but a three dimensional rectangle ( a rectangular prism ) can be cubic.
Volume is typically measured in cubic units. Common units include cubic centimeters (cm³), cubic meters (m³), liters (L), and milliliters (mL). In the imperial system, volume is often measured in cubic inches, cubic feet, and gallons. The choice of units depends on the context and the size of the object being measured.
The shape in question is not a rectangle but a rectangular prism. Its volume is 12.5*10*8 = 1,000 cubic units.