The area under the curve of resources over that period of time should enable this timeframe to be met, but if not this timeframe I think pretty soon thereafter. (businessinsider.com)
The areas under the curve of P wave - related parameters were moderate to low due to poor sensitivity. (jstage.jst.go.jp)
He says the videos help students understand advanced topics, such as how to find the area under a curve using a calculator. (edutopia.org)