Locus in the complex plane: |z-w|= 3

Drag the point [math]z_1[/math] so the length [math]\left|z_1-w\right|[/math] remains equal to 3.
What shape is the locus of all the points where [math]\left|z_1-w\right|=3[/math]?
Explain why the locus has this shape.
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Інформація: Locus in the complex plane: |z-w|= 3