A rectangular piece of cardboard of dimension 42cm×32cm is used to make a box. Square of size 6cm×6cm are cut out from all four corners (see figure). The remaining portion is folded to make a box. The inner surface of the box are painted. Find the total area of the painted surfaces
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Total area of the card board=42cm×32cm=1344 square cm
Cutted portion area=4×6cm×6cm=144square cm
Area to be painted=1344-144
=1200square cm
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