Erlebnisland Mathematik | Technische Sammlungen Dresden | Junghansstraße 1-3 | 01277 Dresden
Erlebnisland Mathematik

Circle and Ellipse

When leading the rope in the groove with your finger the rope remains taut.

In the case of a circle the distance from the periphery to the center is always the same.

For an ellipse it is the sum of the distances to the two “focal points” that remains constant.

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