# Find the Surface Area box (6)(7)(9) h=6l=7w=9
The surface area of a box is equal to the sum of the areas of each side of the box.
2⋅(length)⋅(width)+2⋅(length)⋅(height)+2⋅(width)⋅(height)
Substitute the values of the length l=7, the width w=9, and the height h=6 into the formula.
2⋅7⋅9+2⋅7⋅6+2⋅9⋅6
Simplify each term.
Multiply 2 by 7.
14⋅9+2⋅7⋅6+2⋅9⋅6
Multiply 14 by 9.
126+2⋅7⋅6+2⋅9⋅6
Multiply 2 by 7.
126+14⋅6+2⋅9⋅6
Multiply 14 by 6.
126+84+2⋅9⋅6
Multiply 2 by 9.
126+84+18⋅6
Multiply 18 by 6.
126+84+108
126+84+108
Simplify by adding numbers.
Add 126 and 84.
210+108
Add 210 and 108.
318
318
Find the Surface Area box (6)(7)(9)

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