Area and Perimeter of Trapezoids: Lesson

This Area and Perimeter of Trapezoids: Lesson instructional video also includes:

With a little averaging, a trapezoid becomes a parallelogram. The section of an extensive geometry playlist shows how to derive the formula for the area of a trapezoid by changing it into a parallelogram. Using the formula, the video provides examples of finding the area of given trapezoids.

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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Lead a discussion on how the area formula also comes from the sum of the areas of two triangles formed by a diagonal
Classroom Considerations
  • Assumes knowledge of isosceles right triangles
  • It is beneficial to understand the different ways to express dividing by two
Pros
  • Contains a link to additional videos and practice problems
  • Shows all of the arithmetic steps involved in working the examples
Cons
  • None
Common Core