Prompt 10: Surface Area of a Cylinder

1. How do you get from cell 1 to cell 2 and 3? (Geogebra File)

2. Do you show students the geometric form of a factored formula? Is it important that students know the connections between Geometry and Algebra in this case?

3. How might you bring this into a lesson on surface area of cylinders? Card sort? Plenary? Does it change how you teach areas of circles earlier on in the curriculum? i.e. by transforming the circle into a triangle to derive the area formula?

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