Lesson 25 Triangle ratios

Lesson plan

Piagetian Level Learners Thinking and abstract of the activity  
3 B
Mature
Formal






Reflection on limits of sine and tan relations
Prediction in terms of tangent ratio Inverting the sine ratio
3A
Early
Formal






Looking for ratio as independent of size
Comparing tangent and sine ratios to predict values, with rounding, for 45°



Constriction of triangles
2B*
Concrete
Generalisation
Interpretation in terms of same ratio of sides
2B
Mature
concrete
Interpretation in terms of similarity
Middle
concrete
Episode 1
Similar triangles
Episode 2
Exploring the tangent
Episode 3
Exploring the sine ratio

License

Thinking Mathematics Lessons Copyright © by Michael Shayer and Mundher Adhami. All Rights Reserved.

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