What is this curve?

[ValeryOchkov]

When we have not a circle but a line we have a parabola!

When we have a circle we have line (r=0), hyperbola and ellipse? Or?

[ValeryOchkov]

Line and Circle

[ValeryOchkov]

Circle and Circle

[ValeryOchkov]

It is the k-ellipse but not with 3 points - with 3 circles!

[ValeryOchkov]

One more

[ValeryOchkov]

[-MFra-]

Hi,

It seems the curve resulting from the intersection with a horizontal plane of a wave front that propagates in environments with physical properties different from each other.

[ValeryOchkov]

"Бросая в воду камешки, смотри на круги, ими образуемые: иначе такое бросание будет пустою забавой."

Козьма Прутков

("Throwing stones into the water, look at the circles they form: otherwise such a throw will be an empty fun")

[ValeryOchkov]

[ValeryOchkov]

An Ellipse but not with 2 points - with 2 circles:

[ValeryOchkov]

Lemniscate but not with 3 points - with 3 circle

[ValeryOchkov]

An ellipse not with 3 points (focuses) but with a circle and 2 square!

[ValeryOchkov]

Тоже красиво и забавно