Calculation of the area of a disc. The area of a disk is half its circumference times its radius or the product of the constant π (the constant ratio of
Focal ratio (F-number)
In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens’s focal
Moment of Inertia - Point mass
Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation.
is the minimum pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane. It is also defined as