Second moment of area calculation for Simple Symmetrical Shapes - Example 1

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This video covers the calculation of Ixx and Iyy for a simple symmetrical shape where the position of the centroid is aligned in both shapes.
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Why Ah (squared) not added on each formula? Since we have to also look for the area and h (height)

kelebogilesedio
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what is XX ia not at the centre of the object? what if it's at the centroid of the object instead?

astrar