Surface area

Surface area is the measure of how much exposed area any two- or three-dimensional object has.

For a two dimentional object the area and surface area are the same:

 square or rectangle:     l * w  (if square length equals width) 

 circle:      πr2

Some basic formulas for calculating surface area are:

 cube:    6*(s2) , where s is the length of any side,

 rectangular box:    2*((l * w) + (l * h) + (w * h)), where l, w, and h are the length, width, and height of the box,

 sphere:   4*π*(r2) , where π is the ratio of circumference to diameter of a circle, 3.14159..., and r is the radius of the sphere.

An artist should feel free to add some example diagrams.