Forensicmad Posted August 28, 2006 Share Posted August 28, 2006 Hey all, I was sent an AS Maths preparation/revision booklet for me to go over and complete questions in before i go back to school. After one of the questions, it gives a random puzzle and I am stumped. I havent been told how to do it before. It says that a cubiod has a volume of 7.5cm3, a total surface area of 26cm2 and the total lengths of all its sides is 26cm. I am told to give the dimensions of the cuboid. I have absolutely no idea on how to do this. I can find the volume etc from the dimensions easily, but i dont know how to do it in reverse. Could someone please shed some light on how i would go about doing this. Thanks Link to comment Share on other sites More sharing options...
doG Posted August 28, 2006 Share Posted August 28, 2006 It's basically a simultaneous equation, solve accordingly. Link to comment Share on other sites More sharing options...
ajb Posted August 28, 2006 Share Posted August 28, 2006 Do it exactly as doG suggests. write down the forumla for the volume, surface area and sum of the sides. You now have 3 simultaneous equations and 3 unknowns which you can solve. Link to comment Share on other sites More sharing options...
Forensicmad Posted August 28, 2006 Author Share Posted August 28, 2006 Okay, thanks very much. I had no idea that a simultaneous equation was involved. Link to comment Share on other sites More sharing options...
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