Main content

## Approximating areas with Riemann sums

# Left & right Riemann sums

Areas under curves can be estimated with rectangles. Such estimations are called Riemann sums.

If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains ***.kastatic.org** and ***.kasandbox.org** are unblocked.

Main content

Areas under curves can be estimated with rectangles. Such estimations are called Riemann sums.