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Question
A rectangular hollow section with external dimensions 4 cm by 4 cm and thickness of 1 cm will have its moment of inertia about centroidal  X-X axis.
A.
21.33 cm4
B.
1.33 cm4
C.
256 cm4
D.
20 cm4
Answer ( Option D)

20 cm4

Solution

IXX for hollow rectangular section -
Where, 
B = 4cm, 
D = 4 cm, 
b = 2 cm, 
d = 2 cm 

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