LinRTX Posted July 26, 2012 Share Posted July 26, 2012 It is from CWP level 5 and I am stumped as to how to visualize it. It is also in the challenging problems set. Mark has a rectangular cardboard of length 68 cm and perimeter 230 cm. He cuts a part of the cardboard to make a cubical box 12 cm long. What is the area of the cardboard left? I can find the width of the original piece of cardboard. I know the cubical box is 12 x 12 x 12 and I know that once I cut out the part to make the cube I use the remaining dimensions to find the area left. BUT I cannot figure out how to cut out the piece for the cube!!! Linda Quote Link to comment Share on other sites More sharing options...
Syllieann Posted July 26, 2012 Share Posted July 26, 2012 It doesn't matter where you cut the cube from. The sa of the cube is 6*12*12 so just subtract that from the initial area. Quote Link to comment Share on other sites More sharing options...
LinRTX Posted July 26, 2012 Author Share Posted July 26, 2012 Why 6*12*12 and not 12*12*12? Linda Quote Link to comment Share on other sites More sharing options...
Syllieann Posted July 26, 2012 Share Posted July 26, 2012 SA of the cube is the SA of each side, 12*12 times the number of faces, 6. The volume is 12*12*12 but that's not what you're looking for. Quote Link to comment Share on other sites More sharing options...
LinRTX Posted July 26, 2012 Author Share Posted July 26, 2012 Thanks Linda Quote Link to comment Share on other sites More sharing options...
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