What is the trapezoidal rule?
The trapezoidal rule is the area formula for a trapezium with different names for the variables. The rule is used to estimate the area of a shape with an irregular boundary, such as lakes. This post will help you understand the trapezoidal rule in Prelim Standard Math.
How to use the trapezoidal rule to calculate the areas of irregular shapes
The video below explains how to apply the trapezoidal rule to a variety of questions.
Using the rule more than once for one shape
Sometimes, you will need to do two applications of the trapezoidal rule in order to find a more accurate area for the shape. The video below shows you how to do this.