13.1
plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at the
top. Ignoring the thickness of the plastic sheet, determine:
(1) The area of the sheet required for making the box.
- Th&cost of sheet for it, if a sheet measuring .1 m² costs Rs 20.
il The length hreadth
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Answer:
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Dimensions: 1.5m ×1.25m ×0.65m
(i) Area of sheet required for making the box
=TSA−upper face area
=2(1.5×0.65+1.5×1.25×1.25×0.65)−(1.5×1.25)
=5.45m
2
(ii) Cost =5.45×20
=Rs. 109.
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