Find the area of the cardboard required to make an open box of length 35 cm , width 20 cm and height 12 cm
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Area of cardboard= 2( lB +BH+ hl)
=2(35×20+20×12+12×35)
=2(700+240+420)
=2×1360
=2720 cm^2
I hope it's helpful for you.
sjain53770:
35×20 = 700 not 720
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Length (l) = 35cm
width (b) = 20cm
height (h) = 12 cm
so we know That the are of a cuboid = 2(lb+bh+hl)
but the cuboidal box is opened so the upper surface is subtracted
width (b) = 20cm
height (h) = 12 cm
so we know That the are of a cuboid = 2(lb+bh+hl)
but the cuboidal box is opened so the upper surface is subtracted
2(lb+bh+hl) -lb
2(35×20+20×12+12×35) -35×20
2(1360)-700
2720-700 = 2020
so the area of required cardboard be use is 2020 cm^2
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