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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.
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Concepts
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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