Question

A chocolate bar measures 50 mm wide, 90 mm long, and 3 and 1 over 2 mm high. Will’s Wrapping Company is making a wrapper to cover the chocolate bar. Use the correct net and determine how much paper will be needed to make the wrapper.

Answer 1

(50*90)+(50*90) = area of top and bottom of chocolate bar.
(90*(1/2))+(90*(1/2)) = area of long side of bar.
(50*(1/2))+(50*(1/2)) = area of wide side of bar
Total surface area needed = Area of top and bottom + area of long side + area of wide side

Answer 2

The surface area of a rectangular prism is:

A=2(xy+xz+yz), where x,y, and z are the dimensions of the prism. In this case:

A=2(50(3.5)+90(3.5)+50(90))

A=2(175+315+4500)

A=2(4990)

A=9980 mm^2