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Question
The moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base is ... as that passing through its C.G. and parallel to the base.
A.
twelve times
B.
nine times 
C.
six times 
D.
four times 
Answer ( Option B)

nine times 

Solution

For a triangular section of b and height h:

· Moment of Inertia about C.G. (parallel to the base):

· Area of triangle

· Distance between the vertex axis and C.G. axis:

Using the parallel Axis Theorem,

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