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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. |
| How does this applet work? |
| What do m and b represent? |
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