GEOMETRY LATERAL AND SURFACE URGENT (PLEASEHELP)

1.A RECTANGULAR BOX IS TO BE PAINTED ON ALL ITS SIDES. IF THE BOX IS 15 DM LONG, 12 DM WIDE AND 6 DM HIGH. HOW MUCH SURFACE IS TO BE PAINTED ?

2. IF EACH SIDE OF AN OPEN CUBICLE BOX IS 2X+3 CM. FIND ITS TOTAL SURFACE AREA.

3. MICHEAL IS TO MAKE A BOX IN THE FORM OF A RECTANGULAR PRISM. HOW MUCH CARTOON WILL HE NEED IF THE PRISM IS TO BE 32 CM HIGH WHILE ITS BASE IS TO BE 12 CM AND 18 CM.

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asked by Mia
  1. Total surface area of a rectangular box
    =2(lw+wh+hl)
    where l,w,h=length, width and height respectively.

    Total surface area of a cubical box (all sides equal to "a"
    =6a²

    Total surface area of a Rectangular prism : see above for rectangular box

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    posted by MathMate

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