In today's class Mr.Max talked to us about circles again. He explained about which shape we would get if we "cut" a cone using a "razor blade". The following page Mr.Max made during class should explain what I mean to say better.
If a straight horozontal cut is made the shape made should be a circle.
If a diagonal cut is made, the shape should be an elipes (oval).
If a vertical cut is made with a slight slant, the shape should be a prabola.
If a straight vertical cut is made, the shape should be a hyperbola.
The equation used to create an image of a circle or an elips is
(x)^2+(y)^2=(r)^2
The center of the circle will always be at the origin (0,0), unless you move the center point. You do this by using (h,k) ((h,k) is the center of the circle).
The equation you would use will than be (x-h)^2+(y-k)^2=(r)^2
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