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Find the surface area of an open box with length of 12 inches, width of 7 inches, and height of 4.5 inches

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Answer:

Explanation:

l = 12 inches

w = 7 inches

h = 4.5 inches

Surface area = lw + 2wh + 2hl

= 12*7 + 2*7*4.5 + 2*4.5*12

= 84 + 63 + 108

= 255 square inches

If it is a closed box, surface area = 2*(lw +wh + hl)

As it is open, surface area = lw + 2wh + 2hl

Down part of the box : length *width

Upper part of the box = length*width

So, for closed box, 2lw

For open box , lw

User Nick Pearce
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