presentation helps explain conic tangency.
Content: Straight
tangent point of the ellipse.
tengentes Straight from a point outside the ellipse.
tangent to the ellipse, parallel to a given address.
tangent at a point of the parable.
tengentes Straight from a point outside the parabola.
tangent to the parabola parallel to a given direction.
tangent at a point of the hyperbola.
tengentes Straight from a point outside the hyperbola.
tangent to the hyperbola, parallel to a given address.