Two three dimensional figures that have circular bases: Cone, and Cylinder.
A triangle with a circular base
A cone has a circular base.
a cylinder has to have a circular base because it is a circular prism
Strictly, if it has a circular base, it is a circular cylinder. Otherwise, it could have an oval base. If the long axis is at right angles (perpendicular) to the plane of the base, then it is a right circular cylinder.
A cone has a flat circular base
square base pyramid and a triangular base pyramid
A right truncated cone.
Half of a sphere with a circular base is called a Hemisphere.
In a right circular cone a line from the vertex to the center of the circular base is perpendicular to the base. In an oblique circular cone that same line will not be perpendicular.
cylinders are 3d figures that have two circular bases and curved side Vertices are points in which three faces meet
A right circular cone is perfectly balanced on its circular base. Imagine a cone that has a circular base, but leans to one side - this is a non right circular cone.