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There are 12 sides on a rectangular prism.
A rectangular prism has 6 sides.
A right trapezoidal prism has 12 sides. Any prism has three times the number of sides of its cross-sectional shape. A trapezoid has four sides, so a [right] trapezoidal prism has 3 x 4 = 12 sides.
If a prism has a 32-sided base, then the prism has 32 rectangular sides and two sides (bases) that are 32-sided polygons. That makes 34 sides in total.
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