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Video-Iy and polar moment of inertia-right angle-case 2.
If you prefer to watch the video on YouTube, which includes timestamps, this is the title CE110-15-Iy -Moment of inertia, and polar moment for right angle-case -2-English.
The related post is Post 11-Moment of inertia Iy-Case-2 for a right-angle triangle.