What is the sum of distances from any point on the ellipse to its foci equal to?

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Q1.

What is the conic section formed when a plane intersects a cone at an angle of 90° with respect to the axis?

Q2.

Which conic section results from a plane cutting both nappes of the cone?

Q3.

If the angle of the intersecting plane is equal to the angle of the cone, what conic section is formed?

Q4.

Which of the following describes the relationship between the angles for an ellipse to be formed?