See: 
FINALLY PLEASE READILY EXCUSE MY DEAR AUNT SALLY
 order of operations tutorial home page

Math Functions 
computes distance, areas, lengths, square roots, raises to a power

area.xls  computes the areas and perimeters of rectangles, parallelograms, triangles, trapezoids, circles.

area.doc  A Word^{®} document with area formulas for a rectangle, parallelogram, triangle, trapezoid, circle.
