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# Pre-Cal 40S Slides December 11, 2007

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Parabolas, circles, introduction to ellipses.

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### Pre-Cal 40S Slides December 11, 2007

1. 1. Parabolas ... and circles and ellipses too! 12.1 Parabolas
2. 2. And again: Sketch the graph, identify the vertex, focus, equation of the axis of symmetry and the equation of the directrix.
3. 3. the appropriate coordinate of the
4. 4. the appropriate coordinate of the
5. 5. Sketch the parabola defined by each equation, showing the coordinates of the focus and the equation of the directrix. Also write the equation of the axis of symmetry and the coordinates of the vertex.
6. 6. Now, let's explore how we move from the standard form to the general form and back again ...
7. 7. The Circle standard form for the equation of a circle
8. 8. Which equations represent circles? Find the radius, and the coordinates of the centre of each circle.
9. 9. Which equations represent circles? Find the radius, and the coordinates of the centre of each circle.