# Find the Surface Area box (5cm)(8cm)(3cm) h=5cml=8cmw=3cm
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=8, the width w=3, and the height h=5 into the formula.
2⋅8⋅3+2⋅8⋅5+2⋅3⋅5
Simplify each term.
Multiply 2 by 8.
16⋅3+2⋅8⋅5+2⋅3⋅5
Multiply 16 by 3.
48+2⋅8⋅5+2⋅3⋅5
Multiply 2 by 8.
48+16⋅5+2⋅3⋅5
Multiply 16 by 5.
48+80+2⋅3⋅5
Multiply 2 by 3.
48+80+6⋅5
Multiply 6 by 5.
48+80+30
48+80+30
Simplify by adding numbers.
Add 48 and 80.
128+30
Add 128 and 30.
158
158(cm)2
Find the Surface Area box (5cm)(8cm)(3cm)

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