### Areas of a Region Between Two
Curves
If functions f and g are continuous on [a,b] and g(x)
is less than or equal to f(x) for all x in [a,b], then the area
of the region bounded by the graphs of f and g are the vertical
lines x = a and x = b is A = ∫ (lower= a, upper= b) [f(x) - g(x)] dx |