High School Calculus/Definite Integrals

A definite integral can also be defined as

The Area Under the Curve

The area under the curve is found by finding [a,b]

where [a,b] are points on the x axis

[a,b] are the points on which you want to find the area

This can be denoted by $a\le Area\le b$

This is denoted by $\underset{a}{\overset{b}{\int }}f(x)$