derive the formula to calculate total surface area of cuboid plzz fast its very urgent - Maths - Surface Areas and Volumes

Question

derive the formula to calculate total surface area of cuboid plzz
fast its very urgent

Neha Sethi · Accepted Answer

Dear student
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We have 6 faces 
 Two are bounded by length and width, two by length and heightand two by width and height 
 Each face has an area of the two dimenions that boundit from the formula for the area of the rectangle,F1=L×WF2=L×WF3=L×HF4=L×HF5=W×HF6=W×HAdding these 6 together where L=length, W= width and H=heightGives the total surface area which is2LW+WH+HL

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derive the formula to calculate total surface area of cuboid. plzz fast its very urgent