Question

Tracy made a stained glass jewellery box. It measured 20cm by 12cm by 8cm.

a) About how much glass did Tracy use?

b) one piece of glass has an area of 100 cm squared and costs $3.65. How much did the glass cost?(assume all pieces can be used

Please help don't understand this!!!
Ms. Sue
First find the surface area of this rectangular prism.

Surface Area of a Rectangular Prism = 2ab + 2bc + 2ac

http://www.math.com/tables/geometry/surfareas.htm

yes
I don't get this, Can you help and solve the problem.

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