The radius of a circle or a sphere is the distance between the center and the edge. The radius can be used to calculate a circle's diameter, area and circumference. Likewise, a sphere's volume is ...

A sphere is a perfectly round solid figure. All points on the surface of the shape are the same distance away from the centre – we call this distance the radius. The formula for the volume and surface ...

A cylinder is a circular prism close circular prism (cylinder)A three-dimensional figure having two parallel bases that are circles equal in terms of radius, diameter, circumference and surface area ...