h=6.5l=6.5w=6.5

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=6.5, the width w=6.5, and the height h=6.5 into the formula.

2⋅6.5⋅6.5+2⋅6.5⋅6.5+2⋅6.5⋅6.5

Multiply 2 by 6.5.

13⋅6.5+2⋅6.5⋅6.5+2⋅6.5⋅6.5

Multiply 13 by 6.5.

84.5+2⋅6.5⋅6.5+2⋅6.5⋅6.5

Multiply 2 by 6.5.

84.5+13⋅6.5+2⋅6.5⋅6.5

Multiply 13 by 6.5.

84.5+84.5+2⋅6.5⋅6.5

Multiply 2 by 6.5.

84.5+84.5+13⋅6.5

Multiply 13 by 6.5.

84.5+84.5+84.5

84.5+84.5+84.5

Add 84.5 and 84.5.

169+84.5

Add 169 and 84.5.

253.5

253.5

Find the Surface Area box (6.5)(6.5)(6.5)