The surface area of the box = 312 sq. inches
What is the surface area of a cuboid?
Let the length of the cuboid be l, width w, and height h.
Surface area of a cuboid = 2(lw + wh + hl)
How do we solve the given problem?
In the given problem, it is said that the box is 12 inches long, 8 inches wide, and 3 inches high.
Since box is cuboidal in shape, we use the formula of the surface area of a cuboid.
∴ l = 12, w = 8, h = 3.
Surface area of the Box = 2(lw + wh + hl) = 2( 12*8 + 8*3 + 3*12)
= 2( 96 + 24 + 36 )
= 2 * 156
= 312 sq. inches
∴ The surface area of the box = 312 sq. inches
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