and \(\sqrt {{g^2} + {f^2} - c}\) is the radius. Notice that for the circle to exist, \({g^2} + {f^2} - c\textgreater0\). Look at the following worked examples.

How many of these circular objects can you name? The radius (or ‘radii’ for plural) is the length of a straight line from the centre of the circle to its circumference. All radii of a circle ...

With 3D printed arms of fixed measurements, the depth reading from a set of digital calipers can be used to calculate the radius of a curve. Specialized tools that focus on one particular job tend ...