Q : 1       A plastic box \small 1.5\hspace {1mm}m long,\small 1.25\hspace {1mm}m wide and \small 65\hspace {1mm}cm deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet, determine:

               (i) The area of the sheet required for making the box.
 

Answers (1)

Given, dimensions of the plastic box

Length, l = 1.5\ m

Width, b = 1.25\ m

Depth, h = 65\ cm = 0.65\ m

(i) The area of the sheet required for making the box (open at the top)= Lateral surface area of the box. + Area of the base.

  = 2(bh+hl)+lb

\\ = 2(1.25\times0.65+0.65\times1.5)+1.5\times1.25 \\ = 2(0.8125+ 0.975)+1.875= 5.45

The required area of the sheet required for making the box is 5.45\ m^2

 

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