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Take a radical look at square roots. The presentation examines square roots as the lengths of the sides of a square with a given area on the coordinate plane. Using this method, it is clear why the square root of a number can be positive or negative. This interpretations shows why in the real numbers, there is no square root of a negative number.
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CCSS:
Adaptable
Concepts
Additional Tags
Instructional Ideas
- Use the areas of squares to determine the first 20 perfect squares
- Lead a brainstorming session on how to determine the square root of a non-perfect square using areas of squares
Classroom Considerations
- The class should know what it means to square a number
- This video is hosted on YouTube
Pros
- Includes a graphical display of 4-D to show it is hard to imagine
- Contains closed captioning
Cons
- None