Base your calculations of the areas of triangles on their bases. An illuminating video in the Socratica Geometry playlist explains how to determine the areas of a triangle. The video uses an animation to illustrate how triangles with the same base and height always have the same area.

Concepts

triangles, area of triangles

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Additional Tags

math

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Instructional Ideas

• Use the video as review before a quiz or test

Classroom Considerations

• Pupils should be able to substitute values into a formula
• Assumes learners are aware of dot notation for multiplication

• This video is hosted on YouTube

Pros

• Carefully explains how any side can be the base
  
• Shows how multiplying units results in square units
  

Cons

• Only shows one example in the video