Area and Perimeter of Triangles: Lesson

This Area and Perimeter of Triangles: Lesson video also includes:

Go from a parallelogram to a triangle. A segment of an extensive playlist on basic geometry shows the derivation of the formula for the area of a triangle. The resource works examples that require finding a missing side or height to calculate the area.

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CCSS: Adaptable
Instructional Ideas

  • Lead a discussion on finding heights to different bases in a triangle
  • Review the connection between multiplying by a unit fraction and division
Classroom Considerations

  • Assumes individuals know the Pythagorean Theorem
Pros

  • Uses colors to highlight the triangles of interest
  • Includes a link to more resources on triangles' areas and perimeters
Cons

  • None
Common Core