The left hand rule is an approximate method for finding the area under the curve

f(x) between the limits

x=a and

x = b which uses the formula:

\qquad \displaystyle \int_a^b f(x) \, dx = h(f(x_0) + f(x_1) + ... + f(x_{n-1}))
where

x_0, x_1,... x_{n-1} \, are the values of

x at the left hand end of

n strips, each of width

h
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## Glossary

### rule

A method for connecting one value with another.

### union

The union of two sets A and B is the set containing all the elements of A and B.

**Full Glossary List**

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