When a right cone is cut parallel to its base, the cross section formed is a circle. This is because slicing a cone parallel to the base will produce a shape that mirrors the shape of the base, which is circular in the case of a right cone.

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Here are five related questions to expand on this topic:

1. What happens when a cone is cut perpendicular to its base?
2. How does slicing a cone at an angle different from parallel or perpendicular affect the cross section?
3. What is the equation of a circle formed by a horizontal cut in a cone?
4. How can the volume of the remaining cone be calculated after making such a parallel cut?
5. What are the properties of an elliptical cross section when slicing a cone at an angle?

Tip: Cross sections of 3D objects depend on the angle and position of the cut relative to the object's geometry.