# Integral Approximation Calculator

Use this tool to find the **approximate** area from a curve to the x axis.

Read Integral Approximations to learn more.

Note: use your eyes and common sense when using this! Some curves don't work well, for example tan(x), 1/x near 0, and functions with sharp changes give bad results.

## Plus and Minus

When the curve is below the axis the value of the integral is negative!

**So we get a "net" value.**

### Total Area

If we want a total **area **(say we wanted to paint it) we can use the absolute value function **abs()**. Or we can manually find where the curve crosses the axis and then work out separate integrals and reverse the negatives before adding.