Lecture 16 : Integral from upper and lower sums [Section 16.1]
16.1
Integral from upper and lower sums
We start by analyzing the following:
The Area Problem: The problem is to find the area of a region in the plane that is bounded by the curve from and the .
This raises a natural question: What is the meaning of the word ‘area'? It is easy to answer this question for region with straight sides, e.g., a rectangle, triangle, and a polygon.
The Area Problem: The problem is to find the area of a region 
in the plane that is bounded by the curve
from 
and the 
. 
