Investigating relationships between varying quantities

1. In the figure, the green area covers part of a certain shape. Drag E. What measures of the covered shape changes? remain unchange?

2. Click the checkbox to show BE and AK then drag K. How are the measures of BE and AK related? Represent this relationship in equation form.

3. Investigate the relationships between BE and other properties of the shape ABEK.

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Erlina Ronda , Created with GeoGebra