importance: 5

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# Animated circle

Create a function `showCircle(cx, cy, radius)` that shows an animated growing circle.

- `cx,cy` are window-relative coordinates of the center of the circle,
- `radius` is the radius of the circle.

Click the button below to see how it should look like:

[iframe src="solution" height=260]

The source document has an example of a circle with right styles, so the task is precisely to do the animation right.