The formula for the surface area of a rectangular prism is:

$A = 2lw + 2lh + 2wh$

Where:

• $l$ = length
• $w$ = width
• $h$ = height

This formula calculates the total area of all 6 faces of the rectangular prism, which consist of:

• Two faces of area $l \times w$,
• Two faces of area $l \times h$,
• Two faces of area $w \times h$.

Would you like to see an example of how to apply this formula? Or do you have any specific measurements you'd like to calculate with?