The area moment of inertia is a property of a two-dimensional plane shape which characterizes its deflection under loading. It is also known as the second moment of area or second moment of inertia. The area moment of inertia has dimensions of length to the fourth power.

Furthermore, what is area moment of inertia definition?

The 2nd moment of area, also known as moment of inertia of plane area, area moment of inertia, or second area moment, is a geometrical property of an area which reflects how its points are distributed with regard to an arbitrary axis.

## What is the unit of area moment of inertia?

The second moment of area is used to predict deflections in beams. It is denoted by I and is different for different cross sections, for example rectangular, circular, or cylindrical. The unit for this measure is length (in mm, cm, or inches) to the fourth power, i.e. mm4 or ft4.

## What is the parallel axis theorem?

The parallel axis theorem, also known as Huygens–Steiner theorem, or just as Steiner’s theorem, after Christiaan Huygens and Jakob Steiner, can be used to determine the mass moment of inertia or the second moment of area of a rigid body about any axis, given the body’s moment of inertia about a parallel axis through