Regular Solids of Revolution:

Cylinder

A cylinder is produced via rotating a rectangle about one of its edges as in diagram (a). A cylinder has two equivalent circular bases. The line connecting the centers of the bases is the axis, and such is perpendicular to the bases.

 Cone

 A cone is produced via rotating a right angle triangle about one of its perpendicular sides. The lateral surface is connected along with circular base as displayed in diagram (b). Line connecting apex and centre of base is the axis and that is perpendicular to base.

Sphere

A sphere is a solid of revolution produced via rotating a semi-circle about its diameter as displayed in diagram (c). The mid-point of the diameter is the centre of the sphere.

Oblique Solids

Oblique cylinders and cones contain their axes inclined to their bases as displayed in diagram (a) and (b). Oblique cylinders and cones contain their axes inclined to their bases as displayed in diagram (a) and (b).