6.1.4. Parallel Axis Theorem

Reference: Abbott, Richard. Analysis and Design of Composite and Metallic Flight Vehicle Structures 3 Edition, 2019

If the moment of inertia of a cross section about a centroidal axis is known, the parallel axis theorem is used to calculate the moment of inertia about a parallel axis:

**Figure 6.1.4‑1: Definition of terms for Parallel Axis Theory**

6.1.4. Parallel Axis Theorem

Reference: Abbott, Richard. Analysis and Design of Composite and Metallic Flight Vehicle Structures 3 Edition, 2019

If the moment of inertia of a cross section about a centroidal axis is known, the parallel axis theorem is used to calculate the moment of inertia about a parallel axis: