A cone has a circular base.
cone
a cone.
1 circular base
the cone.
A cone
cone
hemisphere
Cone
A cone.
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.