Moment of Inertia about x-x axis is defined as the quantity expressed by the body resisting angular acceleration. And is denoted by Ixx. Moment of Inertia about x-x axis is usually measured using the Millimeter⁴ for Second Moment of Area. Note that the value of Moment of Inertia about x-x axis is always positive. Typically, the value of Moment of Inertia about x-x axis is greater than 0.