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Handout
Wolfram Research

Wolfram Math World: Trapezoidal Rule

For Students 9th - 10th
This site from MathWorld.com give a formula for a two point trapezoidal approximation for the area under a curve.
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Activity
Interactive Mathematics

Interactive Mathematics: Trapezoidal Rule

For Students 9th - 10th
Using trapezoids, the area under a curve can be determined. The Trapezoid rule is demonstrated to show exactly how that can be accomplished.