PF1 = 11
PF2 = 5
PF1 + PF2 = 16
Click the P point and drag to change.
You can move the graph up-down, left-right if you hold down the "Shift" key and then drag the graph.
You can use this to investigate the property that Length PF1 + Length PF2 is constant for a particular ellipse. In this example, PF1 + PF2 = 16.
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