Cones – A Circle Joined to a Single Apex
A cone is a solid with one flat circular face (the base) and one curved surface that tapers up to a single point, called the apex – just like a pyramid, but with a circular base instead of a polygon. A cone has exactly 1 vertex (the apex), unlike a cylinder, which has none at all.
You can think of a cone as a “circular pyramid” in the same way a cylinder is a “circular prism” – it shares the pyramid's tapering shape, but with a curved circular base rather than a flat polygon base.
Properties of a Cone
A cone has 1 flat circular face, 1 curved surface, 1 edge (where the curved surface meets the base), and 1 vertex (the apex).
How many vertices does a cone have?
A cone has exactly one vertex, its apex: 1.
Real-Life Application
- Ice cream cones: a classic everyday cone shape.
- Traffic cones: road safety cones are cone-shaped.
- Party hats: many party hats are shaped like cones.
Key Takeaways
- A cone has 1 flat circular face and 1 curved surface, tapering to an apex.
- It has 1 edge and exactly 1 vertex.
- A cone behaves like a “circular pyramid.”
Practice: Cones
Cones