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Parallelograms same base and same height

Author:
alfinio
As you drag F, you create a family of parallelograms with the same base and the same height.
What can you say about the areas of parallelograms with the same base and the same height? Give a convincing argument that two parallelograms with the same base and the same height have the same area. To change the base of the parallelogram, drag E.