Polar moment of inertia (Ip), in cm4, of a rectangular section

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Polar moment of inertia (I_p), in cm4, of a rectangular section having width, b = 2 cm and depth, d = 6 cm is _________

1. 40
2. 34
3. 33
4. 46

Correct Option: A

Polar MI, I_p = I_x + I_y

=	bd³	+	bd³	=	bd	(d² + b²)
	12		12		12

=	2 × 6	(6² + 2²)
	12

= 1 × (36 + 4) = 40 cm⁴.