Volume 13 b 2 h. Surface area 2 l w 2 l h 2 w h. Since a rectangular box or tank has opposite sides which are equal we calculate each unique sides area then add them up together and finally multiply by two to find the total surface area.
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Use parametric equations to derive the formula for the sur-face area of a sphere of radius a. The surface area is the sum of 2hw 2dw 2hd. Sometimes base and height are used instead of length and width. Lets build our equation for surface area of a rectangular box starting with our cube formula.