Prelim

• Base edge - edges between the base and the lateral faces.
• Base edge - edges between the lateral faces
• Pyramid - not a prism
• Slant Height - Not a part of non-regular pyramid
• Sphere - do not have a circular base
• circle - it is generated when a plane is perpendicular to the axis of the cone
• ellipse or parabola - it is generated when a plane is not perpendicular to the axis of the cone and does not intersect the nape of the cone.
• ellipse - plane is tilted that intersects both generator lines
• parabola - plane is tilted but is parallel to one generator line, and the other one intersects the generator line.