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Moment of inertia of a rectangle (base b, height h) about its centroidal axis parallel to base is:

Ab²h/12
Bbh³/12
Cbh²/6
Dbh³/12
Answer & Solution
Correct answer: B. bh³/12
I_xx = bh³/12 for rectangle about centroidal axis parallel to base. **About base:** bh³/3 (parallel axis: I = I_c + Ad², so bh³/12 + bh × (h/2)² = bh³/12 + bh³/4 = bh³/3).
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