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The ellipse is also a curve that can be formed by slicing the double-napped cone.

What is an ellipse?

In the following action figure, practice slicing the double-napped cone to explore when ellipses are formed.

When you are finished, answer the questions in the question box below to check your understanding of how the double-napped cone can be sliced to create ellipses.

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How does this applet work?

What do m and b represent?