12 the base times the height
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width*height*length=perimeter of a rectangular prism! :)
L=PH L=PH Lateral Area= (Perimeter of the base)(the height of the figure)
Volume of rectangular prism = area of base x height
Volume of a rectangular prism = base x height. If volume and height are known, solve for base area by dividing volume by height.
The lateral area [L] of a right prism with base perimeter [P] and height [h] is L=Ph.