one size of jewel case is 140mm times 120mm times 4mm. What is the surface area of this jewel case?
Google how a "rectangular prism" looks like. It is a 3D rectangle.
Surface area of front and back is : 140mm*120mm*2=33600mm
Surface area of left and right side is: 120mm*4mm*2=960mm
Surface area of top and bottom is: 140mm*4mm*2=1120mm
Thus the surface area of the jewel case is: 33600mm+960mm+1120mm=35680mm
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