This equation computes the x & y components of the Area Moment of Inertia about the Centroid for a right triangle with right angle on right of the base.
The Area Moment of Inertia (I), also called the second moment of area, polar moment of inertia or second area moment, represents how area is distributed around the center of mass. The Area Moment of Inertia has units of length to the fourth power.
This equation, Area Moment of Inertia_Centroid - Triangle (Rt. Angle Right), references 2 pages