The value of moment of inertia of the section shown in the

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The value of moment of inertia of the section shown in the figure about the axis-XX is

1. 8.5050 × 10⁶ mm⁴
2. 6.8850 × 10⁶ mm⁴
3. 7.7625 × 10⁶ mm⁴
4. 8.5725 × 10⁶ mm⁴

Correct Option: B

Moment of Inertia,

I_xx =	1	[(120)³ × 60] - 2		1	× (30)⁴ + 30 × 30 × 30
	12			12

= 6.885 × 10⁶ mm⁴