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# Circle Equations Apr 6

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### Circle Equations Apr 6

1. 1. Circles
2. 2. Circle:   the set of points ( x , y ) that are  equidistant from a fixed point called the  centre of the circle.  Radius:  the distance between the centre of  the circle and any point ( x , y ) on  the circle
3. 3. Equation of a circle with centre at the origin:
4. 4. Equation for parabola:  What does quot;hquot; do to the standard parabola?  What does quot;kquot; do to the standard parabola?
5. 5. The standard form for equation of a circle:  where ( h, k ) is the centre and r is the radius
6. 6. Equation?
7. 7. Second form for circle equation:  where d, e, and f are real numbers and  completing the square of this equation will  convert it into standard form.
8. 8. Convert to standard form then graph:
9. 9. Exercise 21 Questions 1 ­ 7